You don’t know what he’s into. That might have been a turn-on.

If that was enough to put him off, he's not worth it. He could also have a partner already.

Yeah, how dare you do human things like get the runs! Shame on you OP!

Bitch, you missed an opportunity; "I'll need this tomorrow after you've fucked the shit out of me"

Why are people embarrassed about buying stuff like that? I’m the one that shops so I get to pick up everyone’s otc stuff. Including adult diapers for someone. Who cares? I think he understands how the digestive system works unless if he missed every grade in school as well.

"It's for ah.... my mother's uncle's cousin's stepfather's grandma-in-law!"

You need to read the book "Everybody poops"

“Hey babe, I got something that’ll stop your diarrhea ;)” is what he should have said.

I don't see what the problem is. You're a human with human functions. Everyone buys diarrhea medicine at one point or another and if someone avoids you because of something mundane like that, you're better off not having invested time and effort into them.

“After I bring this back for my roommate, the one who has diarrhea, maybe we can get a drink?”