How to confess my feelings via text?

I have a major crush on this guy I'm friends with and I really want to confess my feelings. The problem, though, is that we're a bit of a long-distance friendship/potential relationship, so I don't know when the next time I see him in person will be. But I nevertheless want to tell him how I feel, even if I can't do it in person (which I would have preferred).

Would it be weird if I told him with a text message? And if it wouldn't be weird for me to do it over text, how do I go about it without being awkward or scaring him off? I want to be able to be casual about it and play it cool if he turns me down.
How to confess my feelings via text?
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