"There is only one way to find out." That being to face him in person. Or to wait for him to visit, which at this point would be the more likely to happen in the short term.

"But, if he means this much to you, the next time you find yourself sinking into the deeper end of madness... consider how falling to its sway would affect him before you embrace it." Easier said than done with how madness goes, but it might save them both a great deal of grief.