My crush is going to high school?

I'm 13 and my crush is 14. I've had a crush on him for 3 years and I've known him for 6 years. He knows I like him and I'm pretty sure he likes me back. School is starting in like 4 days. I'm going to grade 8 and he's going to grade 9, high school. He's my BFF's brother so I'll probably only see him whenever his sister invites me over to their house. I have him as a friend on Facebook, but he hardly ever goes on. I'm going to the same high school as him next year, but until then, what do I do? Today was probably the last time I'm going to see him in like 3 weeks. We hugged each other so much in farewell. Now I'm not gonna see him in like forever. School's gonna suck without him. I can't wait until we're in the same school again. What do I do until then? Please don't tell me to ask him out, because I'm not going to.