Lack of intimacy

I had a miscarriage last year. We were happy to be pregnant but agreed that we wouldn't "try" but see what happens. Now we never have sex. He has told me various reasons why-focusing on his career, getting older (he's 38), tired, last night he told me last night that he thinks it's because he doesn't want to have children. I don't know what the real reason is but this is really messing with my head. I'm confused and insecure. I don't know if I want to stay married to someone without intimacy and honesty. Any advice?