What are the odds of having a relationship with practically no fighting?

I always tend to go after the girls who seem the sweetest and nicest. Many I just can't imagine getting into an argument with. In fact, I've been wanting to get to know a really cute girl in my college history class. Right now she's just the cute soft spoken stranger. I find it insane how all relationships are just two nervous people who really want to impress each other, then later on in life they argue over stupid ****.

For example, when my parents were together, if one forgot to get something at the store and we've already driven a few miles away, they'd get really mad at each other right away. I'm 99.9 percent sure I'd just say "alright, let's go back" There's NO point in throwing something in someones face. Forgot to pay a bill? Instead of pointing a finger and making them feel bad, I'd just forgive them. People make mistakes, they don't do it on purpose. I've always been a forgetful person, a clumsy person, etc. I know it feels awful when someone gets mad at you over this. I don't think I'll ever be the one to start arguments. Now, hopefully I'll get a woman who is also patient and understanding.