I think I'm on in a similar place to you except that I'm still very much in my nesting relationship with Mike. I explored poly for myself but it didn't feel good for me.
I have retained one male friend however and it's a very interesting and challenging experience. We have been intimate and we do have romantic feelings for each other but we are trying to retain an equilibrium of relatedness
By focusing on our very special friendship. It's a level of friendship I've never experienced before other than inside a primary relationship. It's challenging at times but I think it's a very expanding relationship.
Hope that makes sense.