Hubster losing interest?

My husband for the past several months has been so adamant about TTC. Trying to start a family was actually his idea, not mine. After some convincing and dr appointments, we agreed to TTC #1. After a few months of BD and lots of BFNs, he seems to have lost all interest. He still says he wants to have a baby, but he doesn't seem as eager about it. I'm afraid that he's disappointed that I didn't give him a child sooner. I feel as if the subject has become taboo between us. Any advice, ladies? This is so new to me. I'm already stressed because I thought TTC would be easy for us, and well, it's not. How do I get my "eager to be a dad" husband back?