You and Muichiro are in an argument because you thought he was cheating when in reality he just hugged a person. Your emotions getting the better of you instead of letting him explain got him to get mad and ignore you

One day you went over to his house to apologize for your actions after realizing the big misunderstanding

Muichiro: "What do you want?" He spoke irritated as he only wanted you to understand what happened that day and not let this destroy your relationship with him