Am I a lesbian?

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Hey /lgbt/

Im currently in a relationship with a 20 y/o man and have just come out of a marriage with a 40 y/o man a couple years ago. After my marriage I was offered to join in on a threesome with a guy and a girl because I always mentioned that the girl was hot to her boyfriend. The threesome never happened because the couple split up before we could do anything. Since then I have been off and on again curious. My current boyfriend and I had met up after the threesome offer and the thoughts didn't cross my mind for nearly a year. However, I went out one night with the intent of finding a girl to kiss and I didn't, which left me feeling pretty bummed. Shortly after that my boyfriend and I broke up. About a month later I realized that I had missed him too much to be apart and we got back together; that was back in December of 2016. Recently, like, within the last week, I got shit faced drunk and blacked out for most of the night. One thing led to another and I wound up in a gay nightclub with my mouth on a girl and my hands down her pants. I really, really enjoyed the experience but now I don't know what to think. I love my boyfriend to death but I really want to try being with a woman. I'm scared to try it though because I'm worried that I am gay and I don't want to lose my boyfriend. My boyfriend knows about how I'm feeling, but we don't know how to proceed. He's afraid to let me try it because he's afraid to lose me, but he doesn't want me to not try and be unhappy with him. Neither of us are feeling great about the whole situation and we're just looking for suggestions or guidance from anyone with similar experience. I should also mention that I have kissed multiple girls over the years, starting in my early teens into my mid twenties, but never thought anything of it.

Thanks for your help. Pic unrelated, just a spam email my boyfriend got once.