when is it too much?

one of my students is a really nice older man. he lately has been bringing nina and I candy or cookies from the cafeteria and its really nce of him1 i can tell nina is hesitant to eat it though lol. he really is so nice and adorable but im no usre when enough is enough. lately he has been waiting for us to leave so he can walk us out. he at first just came with us dow the street until he had to turn. then he followed us to the traffic light. and this time he followed us all the way to the bunting center... was he thiniking he could come home with us?? we carefully avoided that thankfully, but i dont know how to wuite handle this. he really is harmless but you cannot trust everyone. thankfully next is out last class and then he wont be ableto make anymore moves! haha.. at least he is not like the other men in the cafeteria who woot and holler and whatnot at us when we ask if they want to join class!