Most Helpful Guy
From the way you describe it it does sound like he's interested. I can pretty much guarantee that he (and his friends IF he's even told them) don't think that you're a slut. I know everybody's different but personally I love it when a girl gives me her number and the idea that she'd be a slut has never crossed my mind.
As to why he hasn't called there could be a number of reasons. You say he shows signs of interest and yet he hasn't made any move yet so maybe he's shy too and need to work up the courage to call (or text) you. Or, since it's been a weekend, maybe he's been busy visiting family or friends. Or maybe he's one of those guys that think that if he doesn't wait for three days before he calls he'll come off as desperate.
When you see him next time you should go up to him and say; So, I still haven't heard from you? And see what he says. I know that it's going to feel like torture doing that since you say that you're shy but it will accomplish two things. First of all you'll get an explanation for why he hasn't called and second you show him that him not doing that is nothing that bothers you (even though it does).
I understand that you feel a bit rejected, and maybe you were, but that's not the end of the world, it happens to people, all the time and it doesn't mean that you're not pretty enough, there could be any number of reasons for that too if that's really the case.
So don't worry (and maybe you'll hear from him during the day), go to the gym tonight and show him that it was no biggie that he didn't call.
Good luck! :-)0THIS IS NOT RELEVANT ANYMORE