Lean on me...what does it mean?

I was with my crush on the subway and I was tired so I apologized and said that I was going to take a nap. He said that if I want, I could lean on his shoulder. Of course,I gladly took up on his offer. Later, he leaned his head on my head and we slept like that until it was time for me to get off at my stop. Does this mean anything?
Lean on me...what does it mean?
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