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Red flags, green flags and yellow flags: a straight-talking guide to dating

Dating comes with a lot of noise. Somewhere between the first message and the third date you're trying to answer one quiet question: is this person worth more of my time?

Flags are shorthand for the signals that help you answer it. Red ones say stop. Green ones say keep going. Yellow ones say ask a question before you decide. Here's what each looks like in practice.

What are red, green and yellow flags?

  • Red flags are warning signs: behaviour that suggests someone is dishonest, unkind, unavailable or unsafe. One serious red flag can be reason enough to walk away.
  • Yellow flags are things worth noticing but not panicking about. They need context, and usually a conversation.
  • Green flags are signs of someone who is emotionally available, consistent and interested in you. They're quieter than red flags, so they're easier to miss.

Green flags: the good stuff that's easy to overlook

Red flags get all the attention, which is a shame, because the green ones are what you're actually looking for. A few worth noticing:

  • They do what they say they'll do. They suggest a plan, then the plan happens. It sounds basic. It's rarer than it should be.
  • They're consistent. The person who messages you on Tuesday is recognisably the same person you meet on Saturday.
  • They're curious about you. They ask questions and then listen to the answers, rather than waiting for their turn to talk.
  • They're clear about what they want. "I'm looking for a relationship" is a green flag. So is "I'm not sure yet", said honestly.
  • They respect your pace. No pressure to move faster than you're comfortable with, in either direction.
  • They're kind to people who can't do anything for them. Watch how they treat the waiter, the taxi driver and the person who got their coffee order wrong.
  • They talk about their past without venom. Exes can be complicated. Someone who can discuss theirs fairly has usually done some thinking.
  • They make room for your life. Your career, your friends and your commitments are treated as part of you, not competition.

None of these are fireworks. That's rather the point. Green flags tend to feel calm, and calm is underrated.

Yellow flags: ask before you decide

Yellow flags aren't dealbreakers. They're prompts. Most have an innocent explanation, and the way someone responds when you raise them often tells you more than the flag itself.

  • They're vague about what they want. Fine on a first date. Less fine by the fifth.
  • They're very recently out of a relationship. Not automatically a problem, but worth knowing whether they're looking for someone new or something to take their mind off someone old.
  • They're hard to pin down. Busy is normal, especially for the people we work with. Busy and never available is a different thing.
  • They're "not into labels". Sometimes this is relaxed. Sometimes it's a polite way of keeping options open. Ask which.
  • They work all the time. We'd be hypocrites to count this against anyone. The question isn't whether they work hard, it's whether there's room in their life for someone else.
  • Their phone is always face up. Could be work. Could be habit. Could be something else. Worth a light-touch question.

The test for any yellow flag: can you talk about it? If you can raise it and get an honest, unbothered answer, it's probably fine. If raising it causes a row, that's your answer too.

Red flags: don't explain these away

Red flags are the ones people tend to notice and then talk themselves out of. Don't.

  • Hot and cold behaviour. Intense interest followed by silence, then intense interest again. It keeps you guessing, which is exactly the problem.
  • Too much, too soon. Grand declarations, constant contact and talk of the future by date two. It can feel flattering. It's often a way of moving faster than your judgement can keep up. (This is sometimes called love bombing.)
  • Vagueness about the basics. Where they live, what they do, whether they're actually single. Real people answer these easily.
  • Always a reason not to meet. Video calls that never happen, plans that always fall through. Someone who wants to meet you will find a way to.
  • Any request for money. For any reason, however plausible the story. This one is never a yellow flag.
  • Contempt. For exes ("they were all crazy"), for waiting staff, for your opinions. Contempt rarely stays pointed in one direction.
  • Ignoring your boundaries. If you've said no, or not yet, and they push, believe what that tells you.
  • Only available at odd times. Never evenings, never weekends, never a phone call. There may be an innocent reason. There may be a partner.

If someone's behaviour ever leaves you feeling frightened, controlled or isolated from the people around you, that's beyond a red flag. Talk to someone you trust, or contact the free, 24-hour National Domestic Abuse Helpline on 0808 2000 247.

The flags you can't see on an app

Here's the awkward truth about dating apps: some of the most important red flags are invisible on a profile. You can't see whether someone is who they say they are, whether they're actually single, or whether they're looking for the same thing you are. You find out on the date, or a few weeks after it.

That's the part we do differently. At Matchmakers Dating, every member is interviewed in person, ID-checked with photographic evidence and background-checked, including their residency and any reported fraud or financial crime, before they're introduced to anyone. Your matchmaker has met both of you, and understands what each of you is looking for.

What we can't vet for is chemistry, or whether they'll laugh at your jokes. That part's still yours. But you start every introduction knowing the basics are real, which leaves you free to look for the green flags instead of scanning for the red ones.

If that sounds like a better use of your evenings, see how it works or talk to a matchmaker. The first conversation is free and confidential.

And your own flags?

Fair question. Everyone has a few. Running late, replying slowly, oversharing about work: none of it disqualifies you from anything. The aim isn't to be flawless. It's to be honest about what you want and kind while you look for it. That's the greenest flag there is.

Red and green flag FAQs

What is a green flag in a relationship?

A green flag is a sign that someone is emotionally available, consistent and genuinely interested in you: they keep their word, respect your boundaries, and are clear about what they want.

What is a yellow flag in dating?

A yellow flag is something worth noticing but not an automatic dealbreaker, such as being vague about what they want or recently out of a relationship. The best response is usually an honest conversation.

What are the biggest red flags on a first date?

Being evasive about basic facts, pushing to move faster than you're comfortable with, rudeness to staff, contempt for exes and any mention of money problems that seems to be heading towards a request.

Should you end things over one red flag?

It depends on the flag. Some, like a request for money or a partner you didn't know about, are reason enough on their own. Others are worth raising first. If you find yourself explaining away the same behaviour more than once, trust the pattern.

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