Tip #1

Don't take it personally.

She forgot to call you. He would rather spend tonight alone. She just doesn't like to play video games. He really has no interest in watching her favourite tv show with her. Any and all of these are fine fodder for a fight.

But they don't have to be. Try to realize that just because you're with someone, it doesn't mean that every decision they make is going to concern you. My fiance was stressed tonight and decided to spend some me-time at home instead of coming over and sleeping at my place like he usually does. I could get upset and wonder if he really just didn't want to see me and maybe I did something wrong...or I could say, "No problem. Maybe I'll see you tomorrow."

After all, I have days when I want to be alone too.