If your relationship is going down the toilet, and you cannot point to a definitive reason as to why that is happening, always actively rule out another man being in the picture somewhere.
Check phone records. Credit card records. Email records. Yada yada yada. You can’t just assume that no one else is involved. Cheating is by its nature deceptive, so just because you want to believe nothing is going on, and she says nothing is going on, doesn’t mean nothing is going on.
Always actively rule out cheating.
And “yes”, her going out with another guy, “just for _______” is a date. At least that sort of thing was a date when you did it before you were married anyway. It’s a date.
It’s fairly rare that peope just leave relationships for their own peace of mind and emotional balance. It’s very common that people leave relationships for another person. So odds are…