Stay because of the kids or not

Yes, I think many of us do, rather most of do that. It is more like people have arranged marriages and they do it without knowing the other person well, and sometimes not even started to love that person. And eventually they fall in love. So, sticking to a loveless marriage is the same I guess. Plus it does happen that for the sake of kids one has to do deal with the loveless situation because you do not want to deprive kids of the love of both the parents and a scenario that they seem to see complete in nature.