First I think you should tell your wife what happened and about your new found desire.
I love women but I am BI. Bi means different things to different people.
I like the fact that being Bi opens up so many more possible exciting scenarios. Most of my fantasies include bissexual activities too. I am a senior, single male and I am involved with a bi couple. We have a great relationship. Any of my bi activities must include a lady or I don't play.
If I had a relaionship with a lady that did not like the idea of me being bi I would cease my bi activities.
That's my definition of bi, as it relates to me.