It sounds like we are in a very similar situation. I just joined a couple of days ago. PM me if you want to talk or get more details. I identified as bi/bicurious, but I always thought it was kind of a passing thing as I was really happy in my marriage. Have only had experience with my husband and minor experience with a couple of close female friends in HS. Seeing one of those best friends this weekend really hit home for me, and I realized that I'm still in love with her as more than a friend. My husband is ok with me feeling for her (at least he says he is), but that's where it has to end for both of us.
I've stopped making female friends, and have isolated myself so he doesn't feel threatened. I told him I'm miserable earlier, and he ignored me. I dunno. I'm at my wit's end and am not sure where to go with this.