Why do I feel this way about him?

Well maybe he gives you more attention than you've recieved before and therefore you feel this way about him. But also sometimes I believe that people are meant to be together and in that case you just need to let him know how you feel and tell him exactly what you've put on here. I think that how you've explained it here it was very good. You just need to let him know how you feel if you feel that he deserves to know.