@mandmh,
mandmh wrote: Whenever I do see him, I act like I don't know he's there.
What should I do? and How should I act when I see him out of class?
you act like a normal grown-up running into a TA
polite, courteous, you don't pretend you don't see them - you're not a 12 year old (I hope)
once summer school is out and there is no longer a formal academic relationship, you can wait to see if he gets in touch with you - since you already reached out
__
keep on with your life
study
spend time with friends
enjoy the summer
one guy at one point in time - no biggie, unless you're awkward behaviour gets him into trouble
crush on a TA? a half step up from a crush on a camp counsellor