Arguing is "fighting" and when people fight they want to "win" above all else. They're caught up in the heat of battle. Ego pushes people to look for the "knock out" blow. Very few people enjoy losing an argument. It takes maturity to put things in perspective and be willing to "agree to disagree". The relationship loses something with each heated battle. You can't un-say or un-hear what was said or heard.
It's not unheard of for people to apologize afterwards at some point but when they're all fired up they will revert back to war mode.
Some therapist teach couples how to argue or resolve conflicts without taking it to the level of torch everything in sight.
There are only two ways to experience joy and peace of mind in relationships: We either get what we want or we learn to be happy with what we have. Stay or move on. The choice is up to us.
"Never love anyone who treats you like you're ordinary."
- Oscar Wilde
Clearly if someone's aim is to make you feel "low" then they don't think of you as being "special".