My ex of 1.5 years ago was objectively awful to me and after 1.5 years of working on myself and being happy alone I found out ten minutes ago he has a girlfriend and yet it still hurts like a punch to the gut.... Someone shake me straight please because the thought I keep going to is '"I wasn't good enough for him to treat me kindly and now he's found someone he cares about enough to treat well". He was objectively awful to me... Someone say something please

I really thought I was over this guy but apparently not