Just tell him. The worst that can happen is he says no... Or steals your spleen and feeds it to ducklings. Anyways, I hope everything goes well and you find a way to tell him. Maybe he likes you also, but is afraid to tell you? Meh.
Its good that you're both gay but are you both homosexuals. Thats whats important.
Here's what you do...You tell the guy that "you're" going to hell and you know "he" is too, so would he like to go there together???