What does it mean when a guy walks you home?

To get to the point, a guy walked me home the other day. I had met him the day before (Though I'd seen him around school) we ended up talking at tutoring. He lives the opposite way I live. We were talking then he ended up walking me home, he was telling me about how he sees me at lunch and I always look so depressed and annoyed by everybody at my table. Today, I saw him after school again and ended up playing with his hair, stroking his goatee (no pun intended) and just messing around. The question is, is he just a nice guy or is he showing interest? Flirt or friendly?
What does it mean when a guy walks you home?
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