For YOUNGER GUYS: help me!!!!?

So I like this guy and I think he might like me because sometimes I see him staring at me and he flirts a little too. Our last day of school was a couple of days ago so I signed his yearbook and put my number in but he didn't put his number in mine. will he text me over the summer? Is he interested? any advice? by the way i will most likely not see him until school starts again.