Welcome to our forum.
I hope you and your husband can work out an agreement that works for both of you. Maybe he could get emotionally involved with some additional person, even while you keep your additional relationships casual?
Sounds like swinging could be an option for you. In the meantime, I'm glad you could join us on our site, and hope you'll continue to find it useful.
Love means never having to say, "Put down that meat cleaver!"