I can't quit holding myself Hostage and let go....

I'm 32, my now Ex is 22. We were together for a Year and 1/2 we lived together bought a car together etc. WE met a guy on POF who was 55 and offered her money for sex. I know that sounds insane because it is.... however, long before this we had an agreement and so it wasn't a problem. She met him on several occasions even stayed the weekends for more money. Fast forwarding to about 2 weeks or so before she left, he started pursuing her to move in with him, telling her things like I only cared about the money, that he pays her more than she made working anyways, etc. She looked different, acted different everything. April 28th I was upstairs in a phone call I work at home and I heard the front door shut, I look out the window and I see them driving off down the road. There was no conversation no nothing. The next day, same thing, I was upstairs in a phone call while she gathered all her belongings and left to move in with him. For two weeks after she left she seen all my facebook messages but never replied, just left me on READ, Soon after she Blocked me on everything and to this day I havent seen or talked to her once. I remain super sad everyday, she abandonded me with all our responsibilites and Bills it's been a major disaster for me financially. In my head, this goes to show how very immature and hateful she is to do me like that. The guy pays her weekly to live with him, The only thing I ever heard, is it's not the money, and she was adamant about that, rather it was how he treats her. He treats her like a spoiled rotten Teenager, caters to her every need, buys her things, takes her on trips, he even got her a car to drive. He doesn't work, obviously she doesn't work, they literally hang out everyday, watch netflix, smoke weed, etc. Its beyond a screwed up situation, I've tried explaining to her it's all for his personal gain, there's no way this guy truly loves and cares for her. In-fact, when we first came in contact with him, he had another young girl there, she was 20 and was his Girlfriend over a year. Clearly the guy is a sicko creep, I assume he gets them with the lure of money, trips etc. and eventually they move in. In my mind, considering how she left, that we weren't fighting or anything, her saying we were great together etc it wouldn't make sense for her not to return.... but that's the problem, I'm hung up on that, I'm holding myself hostage waiting around, wondering when she'll hit me up. My heart hurts everyday for her and since this is so stupid I don't know how to let it go. Some might say, well why would you put yourself in that kind of situation in the first place etc. and I understand your point, however, We had been sharing partners etc. for a really long time with zero problems. I have low confidence, low self-worth, I believe I'm expecting her to ' save me ' by bringing me happiness and I know that's wrong and negative. Or maybe I'm afraid I'll never find someone else, since I work from Home now and when i met her we worked together at the same place. Regardless she did me so dirty so wrong..... at the very least I hope karma gets her in the end... this guy isn't going to be her future, future husband, they're not going to get married and have kids etc. It's very selfish and immature temproary " fun " on her end. She destroyed me .