I don't want to scare you or sound bitter ,but I read somewhere these men only get into relationship or get married for the only thing they can't get from the enmeshed females from family of origin that is S*X.As heartbreaking as it sounds it is the fact.For women stuck in these kinds of relationships acceptance is the key if wanted to be part of it.If you accept as is ,suffering is less.Best is to not get into such relationship though.