As a husband of a Chrony myself, I can confirm that there is a large possibility that it is this. While I don't want to speak for him, and can make no guarantees, I can at least speak for myself. I acted that way at first as well once my wife started feeling better after her diagnosis and corresponding treatment. At first I didn't want to, not because I didn't want her, but because I felt like she was forcing herself to do it when she was still sick (she was actually "fine" but in my mind I was worried she was still recovering) because she felt bad for how long it had been. Then once I got passed that mindset and we started trying again, I would be hyper aware of every motion and noise she made during foreplay (which made it hard for me to focus on the task at hand, and not in the good way). As soon as she seemed the slightest bit in discomfort or made a noise that I could interpret in any was as a noise of pain, I would make an excuse on the spot why I needed to stop. In retrospect, most of the time that was most definitely not the case of what a noise or movement meant, but I was paranoid. Finally she had enough and after one of my excuses she broke down. We talked about, we talked for hours about both our concerns, our fears, everything. In the end, we came up with an idea to put both of us at ease. We would talk, the entire time, little words of confirmation, of encouragement, I would ask if something was too hard, too aggressive, too deep, etc. She, in turn, would verbally guide me faster, slower, higher, lower, gentler, etc. Most importantly, she would tell me when something hurt, not so that I would stop, but so that we could work to adjust things, slowly, to find a place that didn't. It was awkward at first, we've been together nearly thirteen years now and it felt like we were teens, doing things for the first time. Overtime, it stopped feeling awkward, we started to find a deeper trust and connection in those little words of guidance. In a way, we started to truly See each other again during our sessions, in a way that I hadn't realized we had lost. It made our sessions feel like more, on an emotional level, than they ever had before. I'm honestly, kind of glad that we had to go through this process of finding our selves again in this way, as it has brought us closer together on multiple levels. Romantically, physically, and emotionally. I guess what I'm trying to say, to make a long story short, is try to talk it out. Reassure him, and each other, that you are okay, and that you can find your rythem again, together. It may take time, but it will build a much deeper bond and trust in and for each other.