Um, does he have an ED? Men do not like to talk about these issues and if there are problems with his plumbing working correctly they would much rather escape into a video game and avoid sex rather than admit that there is an issue. Cuddling can lead to intimacy and he may be just trying to avoid that entirely. It more than likely has absolutely nothing to do with you.

My husband has diabetes and when that started affecting things below the belt he honestly believed I didn't notice! Or he hoped I didn't.

What did he say when you talked to him about it?