First year of marriage ???

Okay so my husband and I haven’t even been married a year yet and our sex life is really suffering. We have a pretty great marriage and we communicate really well. No trust issue etc.

BUT within the last month he’s lost his ability to keep it up all of a sudden. Like he’s stressed it’s not me. The last time he even cried and got really upset about it. I don’t feel like he’s seeing anyone else or doing anything that would effect us negatively, but I do feel something is off. Like what else could it be other than he’s no longer attracted to me? We got married pretty quick. And sex has never been an issue for us. But I’m wondering if he’s just getting bored with me or something. I have a huge sex drive and he used to as well up until recently. So I just don’t know how else to take it. I’m hurt. I’m insecure. What do I do ??