Is it worth crying or being sad over a boy?

No, in the long run it never is worth crying or being sad over a boy. I know because I've been there so many times before, and the phrase "There are more fish in the sea." will be one of the truest expressions you'll ever hear. Don't waste your time crying over him. Empower yourself by surrounding yourself with people that care about you, and you'll stumble into Mr. Right soon enough.