3 Years...Still Not Over Her

I'll try to make this as short as I can given all the content. I started dating this girl when I was 19 and we dated for almost 2 years. I am now 24, she broke up with me almost 3 years ago. She was one of my best friends and the first girl I ever seriously dated. I loved her and treated her like gold (the complete opposite of her exes) and she still broke up with me out of nowhere. To make matters worse we each have the same mutual best friend, someone we've known for most of our lives. I don't usually talk about her around him anymore since I don't want him to have to choose sides or have to tell her some of the things I say. I know this sounds stupid that this she broke up with me 3 years ago and I'm still not over it, after all I am an adult. I made the mistake of using her for no strings attached sex from the time we broke up until about 8 months ago (really it was more like her using me for it and me not being able to say no, like I should have). Since she obviously didn't have any feelings it really didn't matter to her yet it certainly didn't help me. I since learned from her about 4 months ago that she was talking to someone and just knowing that she was made me sad and angry. The first week or so it was all I could think about but after that I was surprisingly okay with it. I realized there was nothing I could do and I had to deal with it. I just learned this past weekend through a Facebook post she made that she apparently now has a boyfriend (I deleted Facebook after learning this on there because it really does me no good, it only angers me and makes me sad). I always knew that one day she'd date someone new and it always scared the hell out of me. I guess I always thought it wouldn't be so soon (even though it's really not soon...3 years). But just learning about this has really been eating at me. I wonder how she can be so happy already when I know that no guy will ever treat her as well as I did. And I know she has a thing for picking all the wrong guys (she has daddy issues). I guess I just don't know how to handle myself right now. I find myself thinking about it all day long although I don't want to. I feel a roller coaster of emotions, most of which are rage, sadness and loneliness. I just want to be able to finally get over her. I can't keep letting something like this decide my happiness. However, I really feel that I can't get over her until I find someone else to care about that will care about me back. And ironically, I don't know if I'm even ready to date someone. So I feel like I'm stuck in a paradox and I really don't know what to do. I would really appreciate any feedback, especially if you have been through something similar to me. Thank you for your time.

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