You were 16 when you met Yamato and he was 18. He was supposed to be the mature one when it comes in relationship but it was kind of the opposite.

Not long after you were drained out from this relationship, even though you love him it was starting to drain your mental health so you decided to do the most logical thing.

Break up with him.

"Huh? What did you just say?" Yamato asked his expression turning cold as he heard your words.