arguments and resolving issues

so my parents recently were in a huge fight nothing new I know. Something I came to realize that haopens when you live with a person for a long time. My parents have been married for twenty-five years and I know they wouldn't split or get a divorce over a small fight. Last night however was one of the worst fights I've seen them engaged in since I was about four years old. I was more concerned for my sister because no child should have to witness their caregivers arguing that badly. Long story short my parents resolved their differences the next day and all is good between them. Life is back to normal in my household. I just want to keep the paths of communication open when I live with my significant other someday, I don't want to worry that we'll have a major blow out and he'll disappear for a couple days leaving me worrying myself sick. We've already talked about this issue a few times but you never know how things will play out until it occurs.