I Had Sex With My Teacher

I'm in highschool and had sex with my teacher who was 53. I'm quite short and petite and he's much taller and larger than me. We would do it quite often and he would teach me a lot of things about sex like fetishes and kinks. As a bonus he would also give me higher grades. We experimented with a lot of things including using collars and leashes, cuffs and all sorts of other bdsm things. I even did anal with him. One day however, he stopped inviting me and acts as if nothing ever happened between us. I approached him many times but he would just pretend it never happened. I think I'm already addicted to being fucked rough and hard by an old man like him. What should I do?