There are some relationships where all you are told is tulipigana hivi, or tulimenyana hivyo, yet the couple stay together for the longest time! To make it worse, there are no 'overheads' keeping the two together like babies, marriage, etc

What goes through these couples' heads? I know for girls there might be the 'bad boy syndrome' but I thought that only serves the initial attraction? Why would someone stay in a relationship that is merely one constant fight?