I love my maths teacher and i want to tell him, should i?

Has he actually told you he feels the same, or is this some warped impression that's been created on you through his kindness which you probably 'fell' for anyway? I'm 100% sure this is just a crush. Don't tell him. If you 'loved' him, you wouldn't even bother risking him losing his job and his family, that's so utterly selfish.