If a couple really cannot get on and live together then divorce can well be the best option for all concerned. My son and his on/off girlfriend both live alone, having both come out of soured relationships with selfish ex-partners. They have figured out, however, that they cannot spend 48 hours in each other's company without seriously getting on each other's nerves, so they keep it casual and semi-platonic and it's all working out very nicely. I think they're both shy of getting hurt and fair dos to the oair of them.
However I do feel that too many people go into relationships and marriages these days with the expectation that it will all be honey and roses and if everything does go t*ts up then "we can easily get a divorce". There seems to be no concept of compromise, of give and take. One or both partners wants it all their way and if they can't get it then that's it - the balloon goes up, towel's chucked in and no attempt is made to find a middle way.