I like my best friend but..

So, my best friend and I have known each other for a long time. I've had developing feelings for him. I told my friends and one of them said he might be gay b/c he likes Ariana Grande and hangs out with girls. But in class, he kissed his hand and touched my cheek..I'm so lost because we have so much in common but I don't want him to know my feelings if he is gay. Please send advice.