Hi Mahmi, Sometimes labels are helpful, sometimes they are not. In the end what matters is how you *feel* about your partner. It's okay for you to identify as a lesbian and still love and be attracted to your partner as a man. I suggest you continue to try and communicate your feelings to your partner. He needs to trust what you tell him about your feelings, not what his family tells him about your feelings.
I am MtoF and married to a heterosexual woman. She loves me and fully supports my decision to transition. She is a little worried that people will see her as a lesbian. She has nothing against lesbians (several of our friends are lesbians), but that is just not how she sees herself. We have talked a lot about our future together and we both *expect* that we will stay together, remain be attracted to each other, and have a fulfilling sex life. We also realize that her attraction to me or my attraction to her *may* change once I complete my transition. That doesn't mean that we have to split up or even plan to split up. We'll figure that out if and when it happens.
Kim