It’s evolved a bit into a polyamorous cuckold marriage. Every other weekend belongs to her boyfriend….but really she always belongs to him
You had bought the lingerie for your wife as a birthday present, and although it had been a long time since the last time she'd permitted you to have sex with her, and although she had been cuckolding you for even longer than that, you still hoped that *maybe* -- when you saw her putting on the lingerie -- tonight might be the night when YOU finally got lucky with her again. You were wrong.
There is a part of you that would like to watch -- but it's obvious that your wife would like privacy with him, and she's right that if you do watch, what you see will be emotionally very painful. One thing is for certain -- everything about your relationship with your wife is going to be different after she makes you a cuckold tonight.
Younger man