Moms and Dads

I have never been so pissed/sad/depressed and disappointed all in the past 24 hours. My parents don't really have a relationship at all anymore. They're just my mother and my father. They don't talk to each other, they don't like to be in the same room and they just don't do anything together at all and I hate it. I hate going to my friends house seeing that there parents actually talk to each other, I get so jealous I just want to leave. My family gets along with each other only if my parents aren't in the same room together. I could have the best of times with my dad and the best of times with my mom, but never them together. Them together is torture for everyone around us.
I've always suspected that my mom has cheated on my dad before, and maybe my dad has done the same thing to my mom. My suspicions were proven right last night, I just didn't expect it to be my sisters best friends dad... who is also married. Honestly I'm probably just assuming and making an ass out of myself but honestly it makes sense. I know for a fact that she has a code name for him on her cell phone, I know for a fact that she lied to me about who she was going to dinner with, and I know for a fact that there is chemistry between the two of them.
I hate that my dad doesn't give a fuck. My dad would love to live a single mans life. I think if my dad had the  money he would just move to Las Vegas and live there for the rest of his life. I know my dad tried to keep what ever they had going, but my mom was just never that into it I guess.
They're just together because they can't afford to be a part and that what's sucks the most. I have to see them every day avoiding each other, knowing that they don't want to be together anymore.
This just sucks.