Jealousy is killing a great relationship
Hi, this may be a little long but I'm desperate so I'd be grateful if you'd bear with me and read it, I'd love any advice.
I'm a 21 year old gay girl and have been with my girlfriend for 6 1/2 years. I've always been pretty jealous, never liking her having close friends or anybody she would be really comfortable with. It was never much of a problem and if I didn't like anybody she would usually cut them out of her life for me. I'm not saying that's right, just how we got on, and everything was perfect. We got on so so well, we hardly ever argued, the sex was always amazing and we had a blast just being together.
She has recently been off work ill, with severe anxiety issues. She needed me with her day and night and I did everything I could to get her better and well again. Thankfully she is now feeling much better and has gone back to work full time. However, we have been having the biggest problems of our relationship recently because my jealousy is completely out of control. I am paranoid and controlling, and it is destroying everything we ever had. Since she went back to work, she has become close to a guy there, she was friends with him before but now she says he is like a best friend because he has really supported her while she has been struggling with work (it was work that caused part of her anxiety problems). I am extremely jealous of this guy. She has admitted to me that he has told her he wants to sleep with her, and used to text her inappropriate things, before she put a stop to it. Because she is getting better she is going out more and more with colleagues and this guy always seems to be there. He phones and texts her a lot and each time her phone goes my heart beats so hard and I often feel close to tears.
She has reassured me constantly that nothing is going on, but I have to ask her every time her phone goes who is texting, who is calling and I've begged and begged her to break all contact with him but she won't. Often she won't show me the texts because she says it's the principle.
The trust is all gone, and I can't stand for her to go on a night out without telling me exactly where she is and who she is with. She has told a few little lies, such as it is not him texting or he is not out, and when I found out she said it was so we didn't argue any more. Today I listened in on her conversation and she blew up at me for spying. She said if I don't control the jealousy now she is leaving me.
We have been through so much together, but we are no longer close because if she goes out, goes on the phone or texts I usually always start an argument. Recently she would rather be out of the house than here with me, and I think she's falling out of love with me.
She reassures me constantly that she is not and would never cheat on me, but the sex is gone and we are losing all of our closeness. She says she can't reassure me and repeat herself every day for the rest of her life, but I don't know how to stop being so jealous and possessive and paranoid. How can I do this? And how can I make her fall back in love with me? She says I'm no fun anymore, just depressed all the time but I don't know how to put the fun back.
I don't know how to fix this at all but neither of us wants to break up. I have to change and I have no idea where to start.