You said you are obsessive about him, that is not healthy. What difference does it make if he has other women since you are currently with someone? I don't know why you are caring on with this. If you care about your current guy, stop this mess with the other guy who is a source of problems or better yet, leave them both alone. I don't think you care that much for your current guy, you just want to have someone because you can't have the other guy.