If you have someone in your life who is transgender, other cisgender people might get curious and ask you personal questions. My recommendation is to either tell him over the phone or in a public place, like a cafe or restaurant, so others are there to intervene if he gets angry or violent. These tend to be safer for trans people to use. If you don't know of any place near you that has a single-use or all-gender restroom, check Refuge Restrooms: Take any sign of suicidal behaviors in your partner seriously. Chances are, the answer is no.
The idea that there are only men and women, straight and gay is not how human sexuality works.
How to Come Out as Transgender to Someone You’re Dating
Getting to know your date can sometimes involve wondering about many things, including their gender identity. Yes, a transgender man can obtain a penis by phalloplasty and metoidioplasty. It is not the end of the world. If someone else who knows them well uses a pronoun, that is probably the correct one to use. In fact, it's often the opposite. Why do trans people assume they can take advantage of a man looking for a biological female and not be honest and open?