After - break up experience

Hey, some backstory first I’m 22M, 3 years ago I started dating a girl 20F the first 6 months we were kinda okey with each other she wasn’t loyal but I really didn’t care cuz I wasn’t too (it’s not right I know but who cares). Then we stopped talking for a couple months, suddenly she started talking to me and wanted to reconnect and do it right etc etc.

I know i shouldn’t have accept her back but for the past 1.5 years i went through a very difficult period of my life. I treated her right with respect the only one I fooled was myself

I should’ve ended our “relationship” a long time ago but I couldn’t care for this thing too..

She didn’t respect me or my job, she kinda made me feel little with her opinions about my appearance etc.

I broke up with her and she was fine with this.

I have started dating.

I mean it’s nice to flirt and communicate with others knowing that they like you etc but that as far as the pleasure goes.

I’ve slept with two (separate nights ofc) but I really didn’t like it that much, I faked orgasm and I wasn’t very excited (if you know what I mean)

I would like to hear some opinions about this, how should i act in all this ?