Is Fudanshi Gay?

I have a friend whose boyfriend read yaoi fanfictions from he was still young. He also once (when he was young) said that he wanted to marry to a male actor.
What do you think? Is this person a closeted gay?

Is fudanshi actually gay, bi or just a straight guy who just enjoy malexmale story?

My friend want to ask her boyfriend about his preference but too scared to ask. So she wants to know about this matter.

For fudanshi, please answer these questions Thx ♡