Threesome

My husband likes when I do sexual things with him and other men. Preferably ones he knows and trusts. He either watches or I perform sexual acts on them. It's his fantasy. When we have these encounters they are amazingly fantastic and they actually make him and I stronger as a couple and closer together. The only down fall is like a few days after it happens my husband starts being mean and saying rude comments about how he doesn't do it for me etc. I've never once told him or acted that way and I would NEVER cheat on him. I don't know if I should stop doing it? I don't know how to approach it. I've tried bringing it up and he just says nothing is wrong.

What should I do?