My crush lives in another city. What to do?

Anonymous
So I have a crush on this girl that lives in another city.

The thing is, that she lives not far away from my cousin's (girl) home. Also she is her best friend. Me and my family visit my cousin once a year and I stay there for about 2 weeks.

So this summer we met up, because my cousin invited her to do stuff with us, and spent some time together. It was really fun to be with her and I really liked her.

Unfortunately, I had to head back home.

My crush on her started to get even bigger when I left, because of how I missed her. I managed to find her on Facebook and get her number from my cousin. But all we talked about on Facebook or texting was just a bunch of silly nonsense just for fun. I tried to get a few very slight hints in there, but I don't think they worked.

I will probably only see her the next summer. What do I do? Do I tell her? If so, how do I do it? Or do I wait for when we meet up? I am really scared of her not having the same feelings and that breaking our friendship. Also, I don't know what my cousin would say. Would it be weird to date cousin's best friend?
My crush lives in another city. What to do?
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