I told this guy, i been thinking about him a lot. Im gay.?

so im seeing this guy for about 3 months. and we like each other a lot. he's not mf bf.we always call each other every day. i think about him a lot, so i called him last night and tell him i been thinking about him a lot. he says "why?" i answer coz i been thinking about you. i like speechless after that. what does the "why?" means.