I had one friend in particular. I only knew her for about two years, but I felt like she was the closest friend I've ever had. I remember being convinced that she was sincere and cared about me too. But the last time I really saw her was around a year ago. I still can't stop thinking about her and what happened and it makes me feel very depressed and lonely. My therapist suggested writing a pretend letter to her, but that didn't help for very long. She will sometimes make comments on facebook and I always hope maybe this time she'll start texting me again and we can hang out or something. But that never happens of course, and I feel stupid and depressed and guilty for being so obsessed. 

I was also really confused because I admired her a lot and she would always be upfront with me if I was missing some sort of social cue. But she started to say more and more she was too busy to hang out, but would always go do things with other friends. And she got a boyfriend and I am ashamed that I got really jealous. I tried not to burden her with that but I guess I was awkward around her and them and she figured it out. So the confusing part is that I would ask her if I did something wrong and she would insist everything was fine. And like I said she had no problem telling me when I was being an asshole, so I didn't understand why she never wanted to hang out if everything was fine. I figured that for whatever reason she just wasn't telling me something. So I decided that after this concert we had been planning to go to for months, I would stop bothering her and not text unless she texted me first. While we were at the concert I remember stepping outside and just crying. I don't remember why. I think she happened to come outside and saw me. Anyway, aside from saying happy birthday, she hasn't texted me once since last year. And apparently I still can't get over it. 

Does anybody have similar experiences or advice for coping with these feelings? I feel like shit.