He doesn't want me to shower with him

I've been seeing this amazing guy! I honestly think I'm falling in love for the first time. I've met his family. I've been to his house. He's been to mine. We have great sex. 🥵. Last night we were having sex and after he went to take a shower. I decided to hop in with him. I guess I scared him. He was washing his hair when I hopped in and he froze up for a good minute then finally turned around and jumped back and fell. I almost fell too. He told me please don't do that again and announce myself when going into the while he's showing. I said I was sorry and wanted to shower with him and he says he's not comfortable with that. Even though we just had sex. He said he doesn't like showering with someone else. It makes him uncomfortable. I don't understand. We had sex. Why wouldn't he want to shower with me? Does he hate my body?