Help! I think I have a crush on my English teacher!?

Hi, I'm a secondary school student in Australia and I think I have a crush on my English teacher from last year. I definetly had one last year...we...he helped me a lot cos' he thought I had potential and needed to use it...like told me books I ought to read and asked me to meet him in the staff corridor between cles to talk about my essays etc. so a lot of people teased me and said he showed favouritism. Now that this year he isn't my teacher he seems to have forgotten me completely. He never responds when I say "Morning' " anymore or anything...this kninda makes me feel a bit love sick..at the same time I feel guilty for liking him because he's about 50 and married. What do I do?! (sorry for long story)