I have a crush on my highschool teacher

I graduated a year ago, but since my sophomore year I always had a thing for him. He was married with two kids, but his marriage was falling apart. She was cheating on him and it just was not a good marriage. Anyway we sorta got back in contact after he moved out of town and I found out they were separated and tbh I was kind of excited... we started talking just a bit but he just gets me so excited.. I don't really know what to do