the mood swings are manageable, but eventually they all get bored and think that their life is boring, so something has to change. Most women will get a new lover, perfectly normal, men do the same, so it's fair game. Some will want to go back to their youth and start acting like teenagers.
I don't have problem with older women having affairs and sleeping around, perfectly understandable, but I do have a problem with those who start acting like teenage girls and focus all their social life on facebook and LINE.