FWB... with my husband

My husband and I have been together a really long time and have gone through a lot. He recently left. He feels he can't handle the responsibility of marriage right now.

He's living with his parents right now and they absolutely hate me. But he sneaks over to see me and it is absolutely amazing. I'm surprisingly ok with it, for now. I love how easy things are between us and there is no one I could ever love more. He says divorce isn't something he wants to discuss right now.

I never would have thought I'd find myself in this position, but there it is. I'm trying to figure out how to wrap my head around it and there's no one else to tell. Have I lost my mind?

Edit: I don't really care what else he does or who else he sees. Honestly, the fact that I don't care kind of scares me. I know we're not over, and I don't really need monogamy. I love that we can talk and share our minds and hearts with each other. I don't really need more than that right now.