Ouch. Sorry to hear that. But I'm pretty sure you're 100% right. When she gets into another relationship, which she could potentially do in the future because, well, I've already said it above, I will just get devastated again. Though, I doubt that guy will have the same patience for her mother that I had for over seven years. He will probably quickly realize how lost of a cause her mother is and he will get the hell out of there.
I just realized how much it sucked to hear that she banged a guy from her work. Even if we were 'on a break' from each other. She could've at least waited more than a few weeks until she started inviting people home. I know she didn't really like that stuff and maybe he forced himself on her? I mean, it did seem like she wasn't proud of it.
...
It's 100% impossible to somehow get together with her again when she had sex with another guy, isn't it?
Now I'm imagining some guy banging her in the same bed we used to sleep(as in Zzz) together in.
Goddammit I hate my life so much! I feel so betrayed.
That's not your problem, you shouldn't care about it any longer.
Whether she regretted the sex, enjoyed it or not it's irrelevant and it's not good for you to keep focusing on it although again, I know how hard that is to stop. She has shown no consideration for you so you should not care about her, her choices are hers to make.
Don't try to get back with her even if you can, she's not worth your mental health. Leave toxic people out of your life whenever you can.
I know you hate life but it can be so much better when you're not surrounded by awful people.