I'll just start off by saying I've seen too many verbally/mentally abusive relationships where one of the people says "fighting in relationships is healthy." Not always.
I've been in two types of relationships. One of them was where we would argue and fight over every little thing, the other where we barely ever bicker. I can tell you right now that I much prefer the second of the two.
It's really sad that some people think that excessive arguing is good and healthy. If my significant other is going to sit there and yell and scream at me because I ate the last of the leftovers, then punch a hole in the wall, I'm walking out. It's ridiculous and childish.
My current significant other and I, as mentioned, hardly ever argue. Sure, we have our different viewpoints on things and we have strong-standing opinions on bigger issues, but instead of acting like fools, we sit down and discuss the different topics. You would be surprised how much easier it is to just discuss topics versus yelling and screaming about it.
How do we stay calm all the time? We're in a trusting relationship (as every relationship should be). I trust that when he goes somewhere, he actually goes there. And same for him with me. If one of us feel threatened or jealous, we talk it over. That being said, we also don't dictate each other's lives. I don't care that he sent a snap to a girl I don't know. (I know, crazy theory, right?) I'll just calmly ask him who it is, and he will tell me. And that's the end of that.
Why be in a relationship at all if you're not going to trust the other person? If you must argue about something, do it maturely like the adults you are. (And keep your drama off of Facebook.)