What does it mean when you share an umbrella with your crush?

Long story short, it was raining after class and I offered to share an umbrella with my crush and walked/talked with him til we got to his class. My umbrella was pretty small so we were walking really close. Would a guy do that with a girl he wasn't interested in?

Also I wouldn't call us good friends or anything, we just know that the other one exists, hang around each other in class, and have a shit ton in common. So it wasn't normal for me to offer.
What does it mean when you share an umbrella with your crush?
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