What does it mean if he lets you kiss him on the cheek?

i was at my friends house and when I went to leave her brother who I've always had a crush on went up to hug me. I was about to leave when my friend said I think you guys should kiss. I just laughed and continued walking. then she said at least on the cheek. her brother put his face forward and my friend pinned me up against him and I kissed his cheek. does this mean anything?
What does it mean if he lets you kiss him on the cheek?
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