In fictional relationships, there's a gray area between a Destructive Romance, a Friendly War and Romanticized Abuse. Sometimes the writers make it hard for the audience to figure out if the relationship is even supposed to be a good thing or not. Sometimes the writers don't even know the answer themselves, and sometimes this question isn't even meant to have an answer - the characters are there for the audience to laugh at, and that's all there is to it. Note that this is actually Truth in Television for many people. Probably including many tropers. If you are still confused, let Worf explain.