<human>: Can you give me the gist of the text in a nutshell?

I'm having serious issues getting a grip on my jealousy/anger in in regards to a lady friend of mine. I'll try to be as blunt as I can here. We've been flirting back and forth for about three years now, other than some heavy petting and making out, nothing else has happened. I know...three years....time to leave. The issue is that I've developed strong feeling for her in that time and don't want to just walk away. At the same time, she appears to "flirt" with my friends and acts quite affectionately toward one of them. I hate this, I can't stand it. I know I don't control her, we aren't a thing, and she's free to do whatever. The reason I say "flirt" is because I can't even tell if it's flirting or friendliness, my gut says it's the former...though he has a gf.

In the time we've been together, I think I've become obsessive/possessive of her, she acts differently toward me, less affectionate, and distant. However still flirty and attracted. I can't tell if I'm looking too far into everything or if things really are happening behind the scenes.

I think the bottom line for me is, I can't stand her knowing full well how I feel while flirting with my friend and me. It infuriates me that she won't flat out tell me what's going on.

I'm hurt and angry, and I can't help but feel betrayed. I feel as if my friend has taken my place and now she just sees me as....whatever. I realize this is jealousy, but it don't know if it's unfounded or how to stop.

  I'm aware that my being this...clingy, paranoid, insecure werido is only hurting any hypothetical chance and our friendship, but I still feel it. It's overwhelming and difficult to push out of my head. I don't want to be this way, but I'm not sure how or where to start changing.
<bot>: I feel hurt, angry, jealous, betrayed, and confused. Am I right to feel so, how do I stop for the sake of my sanity and my relationship with her.