If you don't let her, you're going to lose her.
So – you’ll probably be happier staying home. I’ll undoubtedly stay the night with my boss, so don’t wait up.
Your wife decided it was time for the two of you to have "the cuckolding talk" -- and however painful it may be for you to hear this, you can't deny that what she has said about your sexual inadequacy is true, and you know there is nothing you can do at this point to change her mind about starting to date other men. You do wish she weren't going out with one of your friends, but that's also not something you can change.
Your wife has spent a lot of single nights with him, but this will be the first time she's been with him for more than one night -- so you're very worried about what this time on a romantic cruise that they will be spending together might lead to in terms of their relationship with each other and her relationship with you.
More than anything.