<human>: Can you condense the text into a few key points?

I can't really remember a period of my life when I wasn't "talking"/seeing a guy. I've never been guy crazy, but I've always seemed to have one in my life even when I'm not looking. That being said, I've dated a handful of guys. Most were for short periods of time (couple of months). For the most part, I enjoyed being single and wasn't 

I was in a relationship for 2 years, and another for a year. Both of these were with guys I had been friends with prior. One of them had toyed around with me when we were younger (going back and forth between me and his ex), so the thrill of finally winning him over made me stay in the relationship. But I didn't really want to be in the relationship. I then started a relationship with another close friend, and we both left our SO's to be with eachother. At the time, it was very dramatic and seemed like it was the perfect idea. I lost interest about a month into the relationship, and it all went downhill from there.

I've never cheated on anyone, and I don't worry about that. But I've realized recently that I do like the chase of a relationship more than the relationship/person. I also tend to develop stronger feelings for guys who don't show interest in me than those who do. But again, by the time it actually happens, I become uninterested. 

I don't know where I'm really going with all of this. I really do love the chase/thrill/excitement of being with a new person. Whether mentally or sexually. I like to be the center of the other person's world, but I rarely can reciprocate that. And I know that's selfish. 

I guess my question is....has anyone else felt this way? Is it a phase? Have I just not met someone to keep me around long enough? I want to change, but I have no idea where to start. I probably sound like a terrible person.
<bot>: I feel kind of trapped/uninterested once I receive the attention I want in a relationship. Want to kick these feelings to the curb, but not sure how to