Ordinarily, transgender people don’t have to, but it will mess up their relationship since keeping secrets from a straight guy or girl who is interested in the opposite sex will be disappointed in that transgender person and will more likely cut off communication from that person. If you keep your transgender identity to yourself without telling that special someone you like, then that means you’re mostly ashamed of who you are since you’re not being honest to yourself or proud on what you represent. what happens if a straight guy or girl wants to have a child that’s of their bloodline? what will you say if you got that far into the relationship or marriage without telling him/her on who you really are since transgender people can’t reproduce if they got their ovaries or penis removed? Not disclosing on who you really are will make the relationship fake instead of genuine and it will create tension where the marriage will end badly if your wife/husband find out about who you are by looking at your medical history or contact with the parents. What happens if that individual you date hates transgender people? Thing can end badly if you keep up with the secrecy by not being upfront.