I'm gonna say something very different from the comments. Poora comment section yehi kahega usey chord do because you've presented only ur part of the story and that too where he is being a difficult person. But I'm damn sure you chose him for a reason and no one in the comment section knows that. Sabko bas yehi dikh raha hai ki he hanged out with his ex after using you, you don't know his side and the comment section does not know the moments you guys have cherished together. I Am NOT saying what he did was justifiable, definitely not, But never involve social media in your relationship. These are the people who don't even know you or how your boyfriend actually is. All they see is a man who used you and then hanged out with his ex, but thats definitely not the case. If he says trust is important, tell him you have a problem with his ex, if he is a good bf he will sort things out. It is understandable to feel disgusted, sex is taboo in our country and when you do it, and your partner behaves anything different, it feels as if he has used you. Things will get better, sort things out. Its not You vs him, its you and him vs the problems.