Husband doesn't want sex or intimacy at all

My husband doesn't want sex, and hasn't for years despite his vasectomy. My husband and are I young (28 & 31) parents of two boys aged 3 and 4. And try as I might, all the intimacy from our marriage has gone. We are technically 'newlyweds'. As this problem has spanned for 2 years or more I have tried it all, talking about it, lightening his load around the house and with the children, sexy outfits,role playing, gifts,romantic nights, holidays,everything you can think of or suggest. I have lost weight and most importantly changed my lifestyle to be a happier healthier version of the woman he not long married but to no avail. He won't initiate anymore, he doesn't even respond when I make it known subtly or otherwise that I'd like to be with him, he even goes as far as rejecting me plain and simple,for months at a time. he has had a vasectomy so the contraception worry is taken care of. On top of all that all touching,kissing and and physical contact has entirely stopped and I'm at a loss. It's now apparent it's me he's not attracted to and I'm not sure what to do. Anyone been in this situation and made it out unscathed???