Decision by action is the only real kind of decision.
Let his actions speak for themselves.
Do you think it's possible for him to mature as quickly as you did? I mean, 18 months ago there was, I though, little if any hope for you. You've done a damn good job of proving me wrong.
JM, on the other hand, has done NOTHING to change my opinion of him, which frankly makes my most negative views of you look positively glowing.