Language / affectionate term in Polish [59]

well...i have a Polish friend..
he usually called me "aniolku" or "aniolek", i know the meaning..that it's an angel..but, what is actually he's meaning about to me?

i don't feel anything, but then, i called him back with "misiu"
are those words that special??
or, he was just being wishy-washy with girls?

dziękuję..