Need advice

Recently, I was at an event that brings together pharmacy students from all over the country (for 3 days, we have training and discussions; at night, we have parties). So I met this one guy from another city. He's cute and shy, and we ended up making out. Normally, it is not my style to kiss someone I just met, and he told me that it is also unusual for him. We exchanged our social media information, and the next day, we were so tired that we barely talked. But his friends told me that for him to kiss me like that, it is because he must have been interested, cause he's not that kind of guy (if you see what I mean) When I got home, we continued exchanging messages, but now he hasn’t responded for two days. (However, the messages are marked as unread.) He had warned me that he doesn’t use social media very much, but not responding for 2 straight days seems strange to me. Plus, we don’t even go to the same school, so it’s not like I can talk to him face-to-face.

So now I'm wondering if maybe he's just not interested (even though everyone is telling me that he is), or is he just really too shy? Because if he's not interested, I would prefer for him to tell me so I know what I'm getting into.

Any advice? Should I try to write to him again, or should I just give up?