Completely mirrors my story. 8 years later the burning question that lingers is... what if you "found out" you preferred men to women (me)? Since you explored your curiosity behind my back, I  can only assume that my stake in this relationship was of no consequence.  I'll always wonder if your claim that you discovered you didn't  have an interest in men after all, was only because you got caught.

Ahhhh... the story of his deception. Crack open a beer, this is going to be a long one. We were together for over 2 years. A very sexually adventurous couple in our mid 40's. We played in the swing lifestyle. We were open to full swap, partook in a few orgies, but we always played together. No solo dates. We indulged in a lot of anal, with my being on the receiving end. To this point, we never played with his rear end, and there was never any male on male contact.  But  we gradually left the large swinger club and set up the random couple dates from craigslist. We just moved progressively away from that scene. We continued our own kinky sex life. 
At some point, things just felt off to me.  The feeling wouldn't go away. His schedule changed up slightly.. had to work on a few Saturdays which was unusual. The feeling kept weighing on me.  One saturday he went to work. Called me later that afternoon, told me he loved me, asked about my day.. not unusual. Said he'd be home in a few hours. Called me on his way home.  Now, interesting side note, I have a bondage and discipline fantasy that he's just not into. I've tried relentlessly to get him to dominate me, he just wasn't into it. So I let it go. It's no fun if one of us is not having fun. Back to that night... as luck would have it, all the kids were gone overnight.  He surprised me with a spreader bar , porn and brought his inner Dom out to play. It was hot and I was delighted.   That damn feeling that something was off just wouldn't  go away. He had just gotten a new cell phone. One day, I picked up his old one and his email was still running off internet.  I looked at it and found nothing to be alarmed about. I berated myself for being an idiot. Then I hit the trash. Holy shit!! I found emails where he contacted a gay male massage therapist.  I read their back and forth conversations. He mentioned his curiosity,  how he wanted to be fully naked.  How he would be coming from work and wanted a shower before they star