Pretended I was asleep and regretted it instantly

Last night I (F20) had my talking stage (M21) sleep at my place. We shared a bed and everything was rather platonic for the most part, until at around 3 am he popped a mint into his mouth and suddenly hugged me from behind. That was the first time he slept at my place, the first time he touched me like that and the first time I was ever touched like that. Being shy and inexperienced asf I decided I’d just continue playing asleep. I like him, and I liked him cuddling me, but I didn’t really know how to reciprocate. Little did I know for the next ten minutes he‘d try ever cuddling position known to mankind. ATP I was terrified of showing I was actually awake and had just been ignoring his advances. My breaking point came when he asked me to lift my head. Realizing he knew I was awake all along I quickly pretend to wake up. After this he stopped cuddling me. Next morning everything goes well, he even ends up putting his head on my shoulder while he was waking up. The shock came when he texted me after going home. Well, turns out my pulse was so fast that he was able to feel it THROUGH MY ARM. Meaning he knew I was awake all along. Also meaning I stayed there like a log for absolutely no reason. Also meaning I embarrassed myself by pretending to "wake up". He told me he thought I wasn’t into him because I kept lying there stiffly and not doing anything. I ended up apologizing. I admitted that I had been nervous (which he called cute) and I promised I’d do better next time, but the humiliation is eating me up from the inside. I feel terrible for him. I hate how I wasn’t able to give him what he needed. Social anxiety makes stuff like this so hard and now I’m beating myself up for never showing him any physical affection. I truly do like him, and I wish I could give him the same energy back immediately. I‘ll try to cuddle him next time but I fear I might freeze up again. The fact he was shirtless probably didn’t help either tbf lol