How many points do you lose if you come home and find your wife on all fours with a big black guy screwing her as she begs for more and you ask what's going on?
My first wife turned out to be the town slut and was getting dick from a lot of guys but anytime she was horny and let me know that i screwed her and she wanted it never pass up pussy at home.
Since she is a g/f and not a wife you can always ask her if there is someone else if she says no you accept that, but it also lets her know your aware of her acting different. My first wife swore up and down 3 different times there was no one else but she lied each time until she couldn't hide it anymore might be better to find out before getting married.
I don't think wives set out to make hubby a cuck but if they are cheating they won't tell him that her mouth tastes like dick or her pussy is cum filled.Yet she wants to prove she is faithful so allows him to kiss her or lick her pussy before he screws her and she gets a rush knowing he is not aware