"Do You Like Me NOW?"

A reader writes... I’m 18 and the problem is that every time I meet a guy I like I instantly try to do any and everything to make him like me as much as I like him. That means I end up having sex with him and things are great for him, but not for me. He only wants sex or to just be friends. I don’t know why, but I always expect men to change. There’s a guy I’m seeing now I really like, but could I do anything to make him want me in other ways than just sex? We rarely talk anymore and when we do, it’s great, but it doesn’t go too deep. I tried leaving him, but I constantly think about him. I feel so lost. Can you help me out?