Why did my Prof. give me a slightly better grade than I thought I deserved? He knows I have a crush on him and?

tries to be nice to me at times like smiles at me alot, says "Hi" along the corridors, and calls my name in cl alot and nods at me alot, et cetera. I really have a thing for him, and I am a good student. I did well enough to expect an A- but he has given me an A+! Does he like me as well?