Is it normal that i don't respect my dad anymore?

Ever since I found out my dad was cheating on my mom (who I am very close with), my relationship with him is very strained. He not only cheated on her, but then lied to both our faces when we confronted him on the matter separately, even though we had plenty of evidence against him. He later admited that he did in fact cheat on her, but it was too late because my mom has already left to live somewhere else. Also, he would fight with her and pick out her flaws, making her feel bad about herself. I've never seen him show remorse for anything he's done, I dont think he's ever even apologized. He just blamed my mom and said it was her fault that he did what he did. This was a little less than a year ago, and I've come to realize I have no respect for him, and absolutely no trust. This is only one of the many awful things he has done to my mom, and since she's not here anymore he's starting to behave that way to me. It's not physical abuse or anything, just a lot of lying, cheating, and just being a huge piece of shit. I don't want to feel this way though. I want to be a good daughter, because in spite of everything, he is still my father. But after everything he has done, I just have no respect for him as a father or a person anymore.