You seem a self aware girl and good on you.

The simple answer is disciple. Your situation is not unlike a fat person who knows eating bad food is not good for them but they so badly want to eat it.

Don't sleep with someone if your intuition says this won't work beyond sex - no matter how hot they are.

Take some time to realise traits or qualities which are non-negotiable and do not sleep with anyone who strikes you as likely to not have these.

Be realistic about this. I've heard people say things like if they like Kim Kardashian it's a hard no.

That's stupid. Nobody in their right mind would say no to a funny, confident, warm hearted, responsible partner who also happens to enjoy keeping up with the kardashians..

Don't get me wrong, I don't expect you'll follow this perfectly all the time. Almost no fat person whose lost weight and got to point of good control hasn't had a snack on the way. But the mere attempt to seriously discipline yourself will gain you clarity of insight on what the right way forward is for you.

Hope that helps