Aqaaid

Making an effort to respect teacher

Q: One of my teachers does not talk to me because of some misunderstanding which was not my fault. I tried to explain to hime but he did not believe me. Now when I see him while driving, I put my hand up to greet him but he does not respond. I also see him in the supermarket but he just walks past me. I said salaam in a loud tone but he did not reply. My question is that as a Muslim is my duty fulfilled by trying to talk to him and if I see him I would make Salam or put my hand up. Will I be sinful because he does not not talk to me? Have I done my duty?