Really like my friend :(

I've been really good friends with a guy for like 4 years, he's probably my closest friend. Anyway stuff happened between us recently and now I'm starting to think I have feelings for him. This has NEVER happened before, we have always been so platonic and comfortable in each other's company, even when it's just the two of us. I always saw him more like a brother. What do I do? Do I want to know if he likes me? I'm worried it could ruin our friendship aaah :(

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