Coworker Fling is now with best friend
So me (m27) and a coworker f(24) started a sexual relationship. However, I was and still am stuck on my ex. It got to a point tho where the coworker wanted to be more than friends and I agreed to an extent that maybe we could. She ended up going through my phone and seeing that I was still talking to my ex. She got mad and left but eventually we continued how we were going. Another time I felt bad that I had been giving the coworker less and less attention so I played an entire day taking her out. I ended up flaking on this because I was up all night talking to my ex and overslept. I told my coworker this and she got angry but after a few days we were back to our regularly scheduled programming. I was learning I could get away with more and more.
Meanwhile during all of this my friend group knew about her and would rib me because of her appearance and how she would act and stuff especially my best friend (m28). So anyway, nothing out of the ordinary happens between me and the coworker but randomly she stops talking to me. She won’t respond to my texts and I freak out because I had always been able to get her back and this time I hadn’t even done anything. So for days I texted and texted and begged her. I was even confiding in my friends about it. Then finally one night when I was at my breaking point my so called “best friend” finally revealed that he was now having a sexual relationship with her. The same one that was insulting me for being with her.
He’s got way more money than I do and has been showering her with things while also making up things about me to her so now she hates me and HR is involved at work and I’m not to reach out to her at all. She apparently reached out to him first and within the first week they were already hooking up and I was thrown aside. I never was going to date this girl because she does get around and stuff but to have my friend who was putting her down swoop in and go behind my back irritates me. My heart truly does lie with my ex, but I am royally pissed about this situation. He’s telling me and her that he really likes her and could see a future but I think he’s lying because it would get back to her if he said any thing else and he would lose the sexual aspect which I know is all he cares about. So am I right to be angry about this situation when the whole time I was stuck on my ex and was never going to be serious with this girl?