Does he like me or not?

Friday at lunch my friend told my crush i liked him and i wanted to go out wit him! He stood there and smiled. Later on in music cl me,him,and my 2 other friends.I wasnt sitting by him i was 1 seat over my friend was in between.We were laughing and talking together including my other friends.Out of no where he said 'I cant belive you like me."He was smiling. But a cople moonths ago he asked me out as a joke! I cant tell if he likes me or not.... I can never trust him again! How can i tell if he likes me?.Just so u no i only talk to him in music,maybe recess,and channel 1.