Hi Belle, and welcome!
I just joined this forum too, and until yesterday was in a vee arrangement just like yours, for about seven months... but not as healthy an arrangement, as I never did meet my partner's wife (they claimed she didn't want to meet me).
I haven't given up on finding that kind of relationship again, though, and I believe it CAN work. I think it would suit me well because I have kids and want a relationship that doesn't involve cohabitation with the man.
I look forward to hearing more of your story...