How to get the courage to message my crush?

I have a question to ask him about an event going on and my only other friend that would know isn't responding. I don't know why I'm so nervous, we send snapchat streaks every morning but we don't talk. He did message me the other day asking if I still talk to my ex, who used to be his friend but they're not anymore. We talked about some other stuff, and he was leaning toward flirty, but then we stopped and haven't talked since. I just feel nervous starting a conversation first.
How to get the courage to message my crush?
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