This girl seems to like me, but when i show affection - she flirts with other guys to make me jealous. First I thought she was playing hard to get, but then she slept with someone else. We're not together,but she seemed interested... what should I do?

If you feel she likes you or you just can tell listen to your gut, your probably right, if she is trying to make you jealous then she could be interested, oh really she slept with someone else, my advice is if you really like this girl, don't give up, if she seemed interested she may very well be, a lot of love stories etc, don't end well because often feelings are left unexpressed, the worst that could happen is she would say I don't like you back sorry but she seems like she may as hard as it is tell her, before it is too late regardless of her answer you don't want to have regrets. So many people give up easily but keep trying, there comes to a point where you don't want to wait around for nothing so when your ready tell her exactly how you feel, be casual about it. It is best to know, i know this from experience, you don't want to be left in the dark no more so either way you can move on, all the best, don't hesitate to ask any other questions if you need to.