Please please give me your opinion on this!?

I met a guy in November on bbm, we're in the same school and he is a year older than me. We talked constantly! Messing, flirting and just having a normal conversation. He called me beautiful, perfect and lovely. We didn't talk in December as he lost his phone. We started talking at the beginning of January because we became contacts again. We got a bit closer than before. We would stay up during the night talking until we fell asleep, wake up next morning and continue the conversation. He's so nice and funny and actually treated me right. On Friday he texted me and we talked until he said goodnight. There has been no texts since and I'm wondering what he could be doing? Mind games or just lost interest? There was no difference in how we texted however.

What do you think I should do?