I think he means what he says to you but is confused.
A cognitive behavioural therapist might be able to help him identify what it is that makes him feel this way. it might be a fear of getting older, feeling unattractive - it could be anything. If he can recognise that there is a problem and that you are there to help then that would be a HUGE first step. I think you need to see it as not a slight against you or something wrong with you and him, but a problem with him and his head. Like an illness.
saffie
Saffie me 46 H 46 M in 1986 D20,D18,S16,D13 H's A 01/05 to 07/06 H recommitted to M 07/06 renewed vows 09/06 Going from strength to strength