He's your boyfriend since high school, But you only dated him because he knew all the answers in any subject's so you desided to use him for your studies and by the time you're done with school you desided to leave him because you love someone else now, and it's Kenn, his brother.

"Please don't leave me. I'm begging you, it's oky you can use me more, I don't care you can date my brother. Just please be with me!"

He begs a lot because he can't leave without you. He clearly loves you a lot