My everyday dilemma

Trying to start a conversation with MY crush:
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A crush? What's that?

I don't even have my crush's phone number ;_;

I'm the singe friend in my group that give relationship advise... So here we go!
You could write "Hi!" Or "Hey!" Or if you want to be a bit flirty you can write "hi ;)" (sorry about my grammar, I am struggling with my English)