She says I'm like a big brother to her. What does this mean?

6Paul11
So a girl I go to school with says I'm like a big brother to her.

I've been there for her on quite a few occasions, and helped her out a lot. She is a little younger than me too. I get the idea of someone being a "big brother" but why would she say that?

It kind of sucks because I've been into her for a long time...
She says I'm like a big brother to her. What does this mean?
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