Crush Likes Someone Else

So I’ve been friends with this guy for like 3 years now. We talk all the time and we met freshman year. He is my guy best friend. So I started to like him during freshman year and I sorta ignored it cause he liked this other girl. That girl took all his attention and I was sad cause we were best friends and I was suddenly not on his mind and all he wanted was that girl. Then she moved away and he moved this year, my junior year as well as his. He texts me every single day and we talk all night and that crush that I had on him is back. And literally five minutes ago he asks me if I can keep a secret. So I tell him yeah, I never tell secrets. He tells me he likes this girl and my heart literally shatters. So now I’m sad and I feel that I’m not cute enough for any guy. I’ve started working out so I can look better and skinner, I don’t eat lunch at school and rarely eat dinner. I’m just so self conscious. This is me. And just like that I want to take it down as soon as I put it in here but I need to hear that I’m not ugly or should do this stuff because I’m good enough. I just feel like I’m not.