Hazel - a close friend of mine was in a similar situation many years ago - her husband had depression - did'nt want sex - kept threatening to kill himself if she left. She tried her hardest to conform to his way of life, but being an outgoing person, it nearly broke her. I took her to a health farm for a weekend break, and we had a good talk - and when she got back, she found condoms hidden in his wardrobe.
To cut a very long story short - she left him - married her boss - lived happily ever after. He never commited suicide, remarried, changed his job and went on to have children with his new wife, which he never wanted any with my friend.
She wasted 15 years on him.