Privet.
I have some problem in finding the following idiomatic expressions in Russian:
1. These two are a couple. They are in a relationship.
2. These two were a couple (i.e. not married couple). They broke up.
3. The reason why the broke up is because they were fighting all the time (i.e. they were arguing and shouting each other, but they were not hitting other)
Spasibo.