What did he tell his friends?

So about a month ago I slept with a guy who works for a sales company like I do but at a different one... I met him because he was trying to sell me something on the streets.. we had a great conversation and traded our snapchats and kept in touch... thats how it all kinda happened but whenever I see his friends they keep on asking if I am that one girl and they make jokes saying "was it great with him" and just laugh and leave... they also start laughing when they just see me.. and I just don't understand why like what did he tell them and why are they acting like this around me?
What did he tell his friends?
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