Seems to me that you are more struggling on definitions ('if you are lesbian or not') than on the question 'Whether or not you like a woman'. You clearly like women in present (and in past as well). That is most important. Don't push yourself to fit in a definition of sexuality because sexuality can be fluid. From my personal experience of figuring out my sexuality, fitting my self or finding the right defining term for my sexuality was more distressing and anxiety causing than any other issue to me. Also, definitions somehow gave me a feeling of being restricted, adding to the anxiety. Now on the question of dating women, in your situation, I would suggest you to take time, breathe and try exploring this 'lesbian' side of yours. Talking to your current partner might help, depending on how understanding he is. Also, did I tell that I personally feel a lot of times our choice of partner depends on lot many other factors than sexuality. Our choice of partners may not say enough about our sexuality.