HELP!!! Should I tell my guy friend that I have a crush on him??

I am really good friends with this guy and I have had a crush on him for a very long time. My friends say that whenever we are around each other he flirts with me. I am pretty sure the feeling is mutual. The only problem is he is in a relationship and going back home to another state. My dad says I should tell despite his relationship status but I don’t know. So what do you guys think?

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