Your wife went to a concert with her ex.
Yes, I am married. But that's not a problem.
When your wife is with him, you can't help thinking about him holding onto her hair to help control her as she pleasures him in that way that she absolutely always refused to do with you -- which, of course, just makes the pain of her cuckolding all that much worse for you. And to add even more to your shame, whenever he comes by to pick her up for a date, he always likes to tease you about how soft and sexy her lips are -- while mentioned that he knows you've never felt them in the way that he does every time they're together.