How can I get over my crush?

My crush broke my heart a couple of weeks ago and when I told him I thought about him he felt uncomfortable. He said that he doesn’t see me more than just a friend who wants to use me as a buddy or pal. He said also that frankly that makes him very uncomfortable because we are such great friends m, he values our friendship too much and he doesn’t want to break that friendship so dating me would be very uncomfortable.
That was cut a harsh but at least he was honest about it and he told me that he’s interested in another girl anyway and they’ve been seeing each other for a while. I told him that I was happy for him but deep down inside I was crushed. Then two days ago when I was going to the store I saw him with that girl and I saw them kiss curse and it crushed me. I didn’t even bother to say hi to them I just left the store. I can’t stop thinking about him! 😭😭😭
I really really liked him a lot. He’s funny, smart, makes everyone laugh, crazy, he such a great friend to everyone including me. He has a heart of gold and he’s one of the most genuine people you’ve ever known. If I draw me to wake him but unfortunately he doesn’t feel the same way about me. I wish that girl was me. I’m still crushed over it. He’s cute too. My best friends told me I need to snap out of it and get off of him. They said they told me he didn’t like me and I should have listened. They’re TOUGH. Weren’t really gentle with me about it. 😭😭😭😭😭😭😭😭💔💔💔💔💔💔