"I couldn't take anyone with me!" The reason for it is obvious and underlined in the silence that he didn't follow that up with. Because it could be risky. Because he wouldn't put anyone else in danger, only himself. That's why he didn't tell anyone, in case they tried to stop him or join him.

(He tries very hard - and succeeds - not to think about how hot it is when Lucifer slams him into the wall. You're welcome.)

"Lucifer." He takes a deep breath and lets it out. The anger and color flashing at him is making him want to squirm from the intensity of it aimed his way. "I'm sorry I scared you. Truly. I wanted to be wrong, and if I was, no one would have to know about it." That would have been the ideal situation. "But this knowledge could save lives."