Rinsing Mouth After Oral

So the guy I’m seeing went down on me for the first time the other night, and almost immediately afterwards got up and went to rinse his mouth at the sink. He made sure I came before he got up (oh, did he EVER), and sat for a minute while I kind of recovered, so it’s not like he bolted the second I was done or anything. Has this happened to y’all? Am I offended, or is this totally normal? Lol (For reference, he cums in my mouth every time we have sex, and while I’ll take a few swallows of water if I need to, I’m not rushing off to rinse at the sink either. So maybe that’s why it weirded me out a little?)