My take? - Ask his mom if H ever was treated before for any psych issues. Don't tell her about the email, just say he's been acting strangely and you're worried about him. If he attempted suicide as a teen, or had a psychotic break, that might be important to know in light of his current sitch.
- If you're really worried about him, just ask HIM what he wants. Say "I can see that you're not doing very well and I'm worried about you. Are you going to be okay if we move out? Would you prefer that I postpone moving out for a while?" What's another 3 or 6 months if it keeps him from suicide?
