My boyfriend might be a trans-woman.

So my boyfriend and I have been dating for well over a year. We have moving in plans and a lot of other commitments to each other. And last night he revealed to me that he thinks he is a questioning trans woman. And I don’t know what to feel or say. I understand this is incredibly hard for him. And I want to support him and reassure him. But I don’t know how. I have always wanted a husband, two kids and two adopted kids. This is my fantasy and what I want ultimately in life. I am bisexual and am attracted to women. But I cannot see myself being happily married to a woman. And I’ve expressed this to him and he said that after three months of hormones he would be sterile. Making the option of children difficult. And he mentioned we could freeze sperm but the longer we wait after the freeze period the less of a chance we have of getting pregnant. I am not okay with the idea of a sperm donor. If we wanted to have kids it would have to be within the next 2-3 years or so. And I am not ready for that this quickly. And I care about his happiness so incredibly much. But because of his happiness I may not be happy anymore. I feel absolutely terrible for feeling this way and he asked me not to talk to any of our friends about it so I’m alone and can’t get this off my chest. I’m turning to you ladies anonymously for some supper and space to vent. Any negativity I receive is understandable. But just please remember I’m seeking guidance and understanding....