Hi jesy While I don't think he was being intentionally hurtful to you, I think you can stay friends but don't get into a situation where you are sleeping together as it isn't fair on you because you have feelings for him and you can't separate it from your friendship with him.
Also, I don't think it's healthy for you to obsess over people saying that they thought it was more than FWB, as if it was more than that, he wouldn't have told you he liked someone else. In effect he didnt actually 'dump' you if you see what I mean? Also, all his friends telling you he's been an idiot probably isn't helping.
By all means, be a friend but for now I think you should put some distance between the two of you while you take care of yourself. You made friends easily with his friends, so you are the kind of person other people want to get to know. Take some time out for you
