is that he's actually more scared about what your reaction would be to this event than the event itself. He doesn't have the tools to deal with it, and fears losing your love, appreciation and admiration over all else.

telling you IS the end of the world. meanwhile, it's sucking the life out of him and he can't figure it out on his own. Glad you're getting him help.

If true, one thing you could do is repeat the message to him over and over and over, that no matter what is bothering him. No matter how ugly or hard or disgusting the topic, that you will always love him no matter what. And that he can trust you no matter what to tell you whenever he's ready so you can help him.