Is it normal he acts like he does?

I am a graduated student as of 2015. I had a crush on my teacher. More than a crush really. I was in love with him. I wrote him a love letter telling him how I felt and gave it to him the day before my graduation. During graduation all he did was stare at me and later asked to get a picture with me. So I did and he hugged me after. Wasn't a short hug. He hugged me pretty tightly. The summer went by and I didn't see him until school started again. I was bringing my brothers to their first day because it was a new school. They moved up to where I lived. I went into the school and saw him. He dropped everything he was carrying. He also asked me to visit him after school on Tuesday. Should I? He also messaged me over Facebook telling me he wanted to see me more and he really missed me. Im not sure what to do. I am in love with him but he is married with two kids.