Trying to find a manga/anime

I can’t for the life of me find or remember the name of a manga I’m looking for that I read a while back. It’s a school life shoujo type manga, with a tsundere type female lead and a plain faced, silent, and oblivious male lead. It’s a slow burn and from the start of the manga the girl likes the boy very obviously. The male lead has a large yankee looking friend that is very gentle and sweet and helps the girl.

I think it’s completed, with the male lead becoming a teacher?

If anybody could help me it would make my year. Thank you!