Getting a divorce why is this bothering me???

I’m driving my self nuts!!!!!!!!

My husband has done everything under the sun in this past year and half of our marriage to hurt me from doing heavy drugs, stealing my car, taking my money, trapping me places and taking my keys and my phone. Literally you name it he’s probably done it and I’m the idiot that kept going back until I had my daughter that day I had her everything changed she’s my whole world and the day she was born I realized I can’t put her through his bs so I left. We aren’t divorced yet but it’s in the process. Anyways this is my problem I was scrolling through Facebook and I see my soon to be ex husband in my recommended friends I had him blocked but he made a new Facebook. I regret it, but I clicked and clicked and clicked. Bad idea! 10/10 do not recommend. I saw him talking to other girls and our divorce isn’t even done. I don’t love him at all. I just feel so stupid and like wtf?! I just don’t get it he couldn’t be there for us but he can be there for some random girl? I’m so pissed I can’t even understand it. I just had to get this off my chest I know it sounds so dumb like who cares right? He’s a moron seriously but it’s bothering me for whatever reason. He couldn’t be there for us! What’s really funny is not that long ago he got loyalty and respect tattooed lol what a joke.