To rink176:
Many years ago, I had a marriage that was probably typical with ups and downs - but I still remember at 15-years, it was still a good marriage. Shortly after that, it got real bad very gradually ... nothing violent ... lots of silence!!!
Withdrawal was my punishment, I guess. We went thru our marriage for another 7-years ... too many of them just sort of living comfortably but without communicating. And there used to be a time that every day I came home from work, we would sit down at the DR table ... and talk@!!!!!!
Many years now ... later removed ... I think her silence came at the same time she turned 40 years old. I do believe, that when something goes wrong, there is usually some kind of an event that started it in that direction.
I wish there was some kind of a way you could get him to communicate with you ... and go back for counseling ... and likely medication. Whether or not that's possible, you do need some support - whether it's a support group or by a psycologist .... maybe even both.
Best wishes to you both.