What do you do when your best guy friend tries to date you?

I need help! My best guy friend of 15 years, who is also my music partner, has been trying to date me. All I can say is I adore him to death, but I view him as a brother and not romantically at all. He just got out of a toxic marriage where his ex cheated, and now he's in a really vulnerable and lonely state. He's never tried to make moves on me before, so I don't know what changed. Now, all of a sudden, he is flirting and complementing my looks. He kissed my hand last time we hung out and gave me Valentine's Chocolates. He mentioned wanting to plan a trip to the beach this summer to get away since he's been stressed from the divorce. It's sweet and all, but it has made me feel very uncomfortable and awkward because I don't want to hurt him. It's to the point where I want to avoid him and that's not good because we do music together still and I still value his friendship. I know eventually I'll have to let him know I don't see him as more than friends, I just don't know how to deliver that message to him the best way? I can be a pretty timid girl, especially when it comes to conflict or rejecting people.
What do you do when your best guy friend tries to date you?
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