Firstly, big hugs to you - this stuff is sh*t and I can honestly say that hand on heart.
17th Aug I caught ex husband having cheated (military), saw all the red flags wks before hand (being distant, taking more pride in appearance, talking about different dating apps, love languages etc) He became good friends with another military woman whilst away for work, ex MH nurse, and they developed a rapport - she was helping him with some difficulties and they'd go off into the woods together to talk at night. I warned him of where his friendship was headed, made it explicit if he cheated our marriage was over. Zero remorse or fs given when I caught and confronted him, no emotion whatsoever.
I left in November, was in therapy for 4 months (ended up nearing a breakdown through trying to stay for DD, covering up what had happened, working full time, zero support network, and just trying to process what he'd done/his behaviour toward me)
Despite all this, I blame myself. Yes bought sex toys to spice things up, yes I tried to be and do all the things he needed/wanted to be happy. I knkw logically I am most definitely not to blame, but yes, there are times I miss the selfish pr*ck, or at least the romanticised version of him I've created. I even think, muppet that I am, that I still love him in some way (not enough to believe he was sorry, we could fix things, it was a mistake, wasn't a conscious choice - he just didn't say no, she took advantage of him, I was just waiting 10-15 years for him to do this so I'd have a reason to walk away, and my personal favourite - we'd only had sex 4 times in 7 months) but yes, I do name myself some times and some times I even think I still love him, am gripped with physical pain of hurt from what he's done.
I think it's normal to think/feel those things, but they aren't your sole reality - after all you've got a very good, or lots of very good reasons for it to be over. Those are very very valid.
It gets easier, I'm not a professional but my advice would be feel what you feel, get outside every day, play music (I sing loudly and badly as I run to inappropriate sweary angry break up songs😁), make plans and be kind to yourself - it's a process and unfortunately there's no time line, it's different for everyone. ❤️