Still mad at my Dad

So throughout my childhood my mom and dad always fought. I knew at the age of 8 that he was cheating on my mom. For a long time I’ve been hearing them fight. I’m 20 now and there still married but the house feels tense to where I don’t want to be there. My dad is the one making everything tense and he cheated on my mom 3 or so times throughout my life already. He told me he was going to be a better dad and a better husband to my mom about a billion times but it just isn’t right. I feel bad for saying this but I want them to divorce. I don’t want this whole feeling of tension in my family anymore.

I don’t even know why my mom forgives him. I’m still kind of mad at him for this.

Am I wrong for being mad? I’m on the edge of wanting to move out from them making the house tense as well but don’t even get paid enough.