What are your thoughts?

I was seeing a guy (we split up though) personally now I'm just getting on with my life but i really need to vent and I'd love to know what you think. So he told me he was in a 3 year relationship with his ex before me but she was psycho apparently, cheated on him in the last four months they were together, she would verbally abuse him, even hit him a few times, threw stuff at him, emotionally manipulated him. The list goes on. He's 21 now but for a period of time I think he fell out with his own family so his gf took him in to her house with her sister and parents and he lived there for a bit. She apparently never worked, he'd come home from 10 hours of working to find she hadn't made them dinner or cleaned so he'd have to do it then when he'd finish she'd go off to bed so they never spent any time together. He found out the day after his birthday that she had a private Instagram account where she uploaded nudes but he stayed with her for an extra month until he I guess found out about her cheating. Prior to this the guy she was cheating with she went away for a week with him to a beach, staying in a hotel etc but he (my ex) still stayed with her despite knowing she went away with another guy. She'd also apparently text loads of guys right in front of his face. Would go out to bars and get herself in trouble so she'd need to call him at 3am to help her etc. He's still friends with her parents on Facebook and Instagram so he would still see what she was up to when we were together because obviously her dad and mum would upload pictures of her. Her mum was also super young looking - you wouldn't think she had a 22 year old daughter, is it weird that he would like photos of her where she basically had her boobs out? I dunno my friends seem to think maybe he had a thing for her mum but eh none of my concern anymore. He used to have a drug problem but sorted himself out(from what he told me anyway), that he got from his first gf who got him into drugs, she also cheated on him. We basically broke up because he couldn't be bothered to meet up anymore, maybe one evening a week, would say one thing but do another (like make plans but never follow through), plus he would ignore me for ages towards the end, make me feel second best and sort of entertain other females including a girl he had a thing with. I personally think maybe it was the wrong time for me and him, what his ex did to him must've really hurt and affected him more than he realised so I do really hope he gets himself together and improves for the next girl he finds. What are your thoughts? I know it's long and I'm not really asking anything but I really just needed to get everything out, vent a bit to someone who doesn't know me like my family or friends. Thank you 💕