Say "I Love You" and give him a gental kiss and hug him
Whisper it in his ear while in bed and then kiss his soft skin bhind his ear. i dont know y guys lov that so much, but if it works i say go for it!
You can casually ask who they like and if that doesnt work, well just say "I heard that you liked me is that true?" or something like that. You could also have a friend ask.
Lick his ear.
You can experience yourself when he loves back to you.