Fucking hell, do you all live in inbred backwaters where no one is allowed to speak to anyone else and single women have to go veiled?
Is it one of those mundane/moron things where you don't allow anyone into your house because everyone else is a potential rapist/husband stealer/mugger/member of Al Quaida?
There are dozens of benign interpretations of a group of adults wanting to continue a conversation over a coffee after the pub has shut. ONe, of course, is that the single bloke fancies one of the single women and his married mate is coming along to give him a bit of moral support.
As to the married man neglecting his 'family' no information has been given as to whether or not he has young children - not everyone is a parent, married or not. SO he might be in the pub most nights because his wife is out at her book group/bingo/evening classes/with her own mates most nights.
THose of you who thik you own your partners and that you can forbid them to speak to other people ought to bear in mind that a monogamously-inlined person won't cheat (though might dump an obssessive controling insecure whiner, of course) and a partner who is inclined to cheat will find a way of doing so no matter how much you snoop and threaten and plead, so why not get a little self-respect and stop thinking that a partner is property?