Being transgender women means real women, this is why all transgender women want to e treated as real women, and this is also a big difference between transgender women and MTF crossdressers. Dating transgender women never mean you are gay, it is the same as dating any other women.
Being MTF crossdresser means they are not real women. Some MTF crossdresser just like to dress as women in some special occasions, others just like to dress or act like women. They don't want to change their gender, they are still live as men.