What do you do when you really like someone but you don't want to ruin friendship by saying your feelings?

I like a guy and I really want to be with him in a relationship but I'm pretty sure he doesn't feel the same way I do and I don't want to ruin the great friendship we have just by saying how I feel
That's my big dilemma right now.
What do you do when you really like someone but you don't want to ruin friendship by saying your feelings?
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