<human>: Give me a shortened version of the text

So back in the day, towards end of high school, I was madly in love/obsessed with the old crush. We were close friends for a while, or so it appeared (explain in a few.) so I was into her for three years and I'm not sure if she was just using me the whole time for help but eventually I realized how she was not really who I thought and I decided to stop pursuing her. The reason I never asked her out in those three years was because I was scared and my past relationships before that were much less intensely emotional. 

---
After "forgetting" her, I was obviously kind of sad and depressed so I asked out another girl who I knew from a few years before that I was becoming friends with. 

---
We've been together for more than two years now. I love her and she loves me and everything is more or less fine with us. The problem is that I still can't get the old crush out of my head after all these years. We've lost contact after all these years and I haven't seen her at all. I occasionally see Facebook updates that make me go into a frenzy. We never said goodbye or anything since I felt insulted by her and used. It would be so easy to get back into touch with her but I'm afraid to do it for a few reasons. First, meeting with her or whatever would be like betraying my gf and I don't want to throw away what we have. Second, I'm afraid that the crush is going to act like we were never friends and that she had no idea what I'm talking about. She might also think I'm a creep for still thinking about her after all these years. I don't know why I'm obsessed with her. Her personality is not that good and it's very likely she used me. It might be because she is the first girl I loved it because we had no closure. I'm not sure. Any advice on how I should proceed?
<bot>: crushed hard on a girl three years ago. Got a gf and things are great but still think of the crush after all this time. Advice?