In addition to the script and a lot of common behavioral patterns (confusion, replay, etc.), I *think* another common denominator for MLCers is a very real fear of sickness and aging.
You don't owe him an answer. It's clear he can't see beyond the length of his own nose. But, I agree with KML, focus on how you can best protect yourself.
Me 41, H 47, M 15 yrs, S11, S13 BD 1: 11/4/14 we work on it; really I pretzel myself BD 2: 3/31/15 H goes down to "dorm room" 8/15: H back to MBR 10/15: H back in dorm room 1/18: H files, now divorced