Personally I have male friends from way back and my partner has female ones. Of course we can all compliment each others looks etc as you would any friend. It's fine to give help, even emotional support as well, as you would any old friend. I have even been persuaded by a gay male friend to pretend to be his wife in order to discourage unwanted romantic attention from someone. It's not an issue unless it actually becomes something more than friendship and it's hard to know where that line exists, particularly with an ex-bf/GF who may have had an intimate relationship with your partner in the past. If it's something you are uncomfortable with it's worth discussing with your partner, men are sometimes targets for women who want all their DIY jobs done, IT problems solved or even their loneliness relieved - all of which can be at your expense both emotionally and by eating into the time you have with your partner. Not saying we shouldn't be helping each other, just that some people can make use of us rather than it being a real friendship. As for an emotional affair, I'm also at a bit of a loss at how to identify this. It's more substantial than having a crush on someone but not necessarily physical, I guess. Perhaps MayBee70 has nailed it.