I am not married (yet, maybe in the future future) but I grew up see my parents and other adults (and television).
I think marriage is much more than love, it is called tolerance. You know People grow and change every time (day!!) but not always in the same direction. At the end of the day, you do not own the life of your partner, because you just simply placed your life beside theirs. So I think marriage is not a fairytale that we expect it to be but rather a collection of events over the course of lifetime with this person. And you can choose if you want these every-day-with-the-partner to be happy or miserable. Because you will realise that the fighting wont change the fact that you are married.
To a guy that told me about his parents, do not worry it just the way they talk and to all adult who is married, please try to not fight in front of your child.