Does anyone get kinda sad when they see the way an ex treats their new girlfriend?

We were together for 3 years. He treated me horrible, I mean mentally and physically abusing me. I have always had anxiety but after the things he put me through it made my anxiety worse, he constantly told me I was faking panic attacks for his attention and would sit there and watch me as I struggled to breathe because I just couldn’t snap out of it. We had a child together and he would hold my son over my head “if you don’t do this I’ll take him” just ridiculous stuff. He ran my self-esteem into the ground and my mental health was god awful after him, even now being two years later I still struggle, I’m terrified to date because of him. Which I’ve worked on myself a lot but I still have a long way to go.

Anyways his girlfriend now posted this today and I’m glad it seems he’s “changed” I say that lightly because there’s many times he’s “changed” in the past and then ended up going back to the same crap which tends to happen when he hits the one year mark with someone (he did it to me, he did it to this last girlfriend, and him and the new one just recently hit a year together.) I actually really like her but sometimes it just stings a little when I see stuff she posts because I was literally with him when he had nothing or no one and he treated me like I was less than dirt on the bottom of his shoe. I don’t understand what I did wrong for me to be treated so bad.. I just loved him, I tried to help him, I tried to take care of him. But he broke me in the process. He literally destroyed my entire life, he cut me off from friends and even tried to keep me isolated from family by putting things in my head. I just don’t get it. I feel like I did something wrong, that it’s me. Ya know? But I’m in no way trying to bash the girlfriend like I said I really like her, she’s a nice girl and I hope he continues to treat her well. But it just sucks because I feel like I deserved that same respect and love too.. Also this may be me just having a little “moment” which I do have every once in awhile of why “I wasn’t good enough.” They’re not as frequent as they used to be thankfully but it’s just something that crosses my mind every once in awhile.

**Myself and another woman he did this to, now I don’t know if her and him were just as bad but from what I do know it was pretty close, and this is just one that I know of, who knows how many more there are that haven’t said anything.