Regina
I agree that fights sometimes really aren't worth it, but when they feel like they're important to you, then they are. My general rule of thumb (aside from acting first and apologize later, which is what I do) is 'Is it something that I'm going to give a shit about in a month? six months? a year?' if the answer is yes to any of those, then it's worth fighting about and he needs to know my feelings on it.