maybe it's just me but I'm so annoyed and angry with myself and my sons father. he threw us away…

maybe it's just me but I'm so annoyed and angry with myself and my sons father. he threw us away like we were nothing to him after being together for so long for someone that I was close friends with. I'm trying to cope and be strong for my son but when his dad is putting his new girlfriend in front of seeing his own son makes me so irritated. and thinking that I loved him and still do and to be just treated like nothing and his son treated like he doesn't exist pisses me off even more! I honestly don't know what to do. :(