Threesome Turns Into A Twosome?

I would like to start out saying I love my husband. We have been experimenting with threesomes the last year or two, and we finally slept with my best friend of 15 years. She is gorgeous, everything that I like in a women except that she has a lot of issues and I wouldn't want to date or marry her. The three of us got drunk and started to talk about our sex lives, and before we knew it our clothes were off. At first I was just cuddling and kissing her while my boyfriend got ready for the threesome. I asked her how long she has wanted to fuck me, and she said longer than she wants to admit. I asked her if she jerks off to me, and she said she does all the time, I'm one of her go to fantasies. All this made me incredibly horny, and we got really into the threesome. So much so, that we unintentionally left my husband out of it for the most part. He felt so left out, he couldn't get it up and he stopped the whole thing and made us go home.

I felt really bad and I respect his wishes for us to not sleep with her again, but she lives down the road from us and now I can't stop thinking about her. I touch myself every night thinking about her. I think about the taste of her pussy. I think about sucking on her perfect tits. I especially think about straddling her and kissing her. I would not say I love her. I love my husband unquestionably. But she has a vice grip on my lust right now and I'm one drunken girl's night away from a terrible mistake, I feel it.