Well, it's not easy to answer this question, especially being a single.
The attitude of one-woman men is distinct, otherwise they wouldn't be called so. Actions of other married men (and women) will depend on many factors like their age, children, common property, relationship with the mother-in-law, etc. So there're two ways out: to divorce and start a new life or to ignore this idea and continue enjoying with what has been already acquired.
Taking into account my unwillingness to change anything cardinally, i'd prefer the last variant. I haven't watched that (of 2009, not so old) film, but i don't think it'll influence my opinion. Thanks for the offer.
(Hope it'll be moved to Discussions)