I knew this guy in school for like 7 weeks, we were getting on really well. Lots of girls asked him out and he said no.
I asked him out and he thought about it and then said no. I sit next to him in 2 subjects, will it be awks?
What should I do?

No big deal, carry on as usual

Be friendly,be yourself and if he doesn't see who you really are then he doesn't deserve you

Agreed, carry on, be your same friendly self. It will only be awkward if you get all quiet and shy.

It will be awkward at first but eventually you just have to show him that you don't care if he said no. Try making little talk with him if its awkward at first.