QUICK! WHAT DO I DO!?

well does she usually kiss you on the cheek and hold you from behind or was that just a new thing? see what shes like when she comes back, if shes acting different maybe just wait till tomorrow and see if it is still different and if it is just come clean. it may be the best thing that you could do. you don't want you're relationship to be awkward. it would be less awkward if you both told each other how you felt and then go from there. hope everything works out for the best!