I [36F] cheated on my girlfriend [35F] with her husband [45M] [MF]

So as you can guess from the title this is a bit complicated. I have been with my girlfriend for a couple years. She is married and obviously bi as am I. Her husband doesn’t know about our relationship. As far as he thinks, we are just very good friends.

I met Jennifer, my girlfriend, at work. I was in a dead end relationship with a guy. She was married. One night at my house, we were discussing our relationships. I was beginning to suspect I bi or gay but was ready to admit it yet. I had had one lesbian experience in high school that was short lived. I kissed a couple girls in college or at bars but more as a for show type of thing.

Jennifer was more experienced. She had dated a couple girls before she met her husband. Before they were married, she brought in another girl for a threeway with him a few times. She’s said she suspects he’s cheated on her but they have an unstated Don’t Ask, Don’t Tell policy.

That night we ended up kissing and she fingered me. We didn’t do anything for a few months but eventually we went further and became a regular thing.