i don’t think you should confront him at all. I had a horrible experience in 8th grade with a teacher. I won’t go into detail but it was VERY bad. I moved on, and completely put it behind me. Maybe the person shouldn’t have been teaching, maybe they were wrong, and probably i was also wrong. But why call them up now, so many yrs later and bring all the pain up again? what’s the use? unless you do need him for something. He is most likely not going to apologize.
Another story with false accusation happened to someone very close to me, and yrs later if someone was choshed beksheirim this person, they would become SO hurt and bring up the story that happened when the teacher (that case a few teachers and also the PRINCIPAL) falsely accused them. Yes, mechanchim and mechanchos have a HUGE achryais, it’s very scary, and they need a lot of siyata dishmaya.
I think – Just put it behind you, there’s no use in bringing it up again.