The context of the following conversation is Alex never would have found out if he hadn't found the love letter his wife sent to someone else.:
Alex says My wife is in love with another man..
The friend responds What? How do you know that?.
Alex responds In the mail today there was a letter in her handwriting that said "return to sender." It was handwritten in a fancy envelope so I opened it..
The friend responds And what did it say?.
Alex responds It was a love letter to a man named Paul. She admitted that he was all she thought about. I don't know if he rejected the letter or it was the wrong address but it is currently in my car..
The friend responds Wow, Alex. That is rough. I'm so sorry, man..