My guy friend is jealous I like someone else. What can I do?

I met this guy and I really like him. My guy friend has liked me for the past 3 years but I don't see myself with him because he's really older. He's already told me that he would cut our friendship off if me and this other guy get together but I value our friendship so much and don't want to lose him.

My guy friend is jealous I like someone else. What can I do?
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