I Broke The Peace Between My Older and Younger Siblings

When my older sister started dating, I got this weird feeling that she should date someone cooler or better. So I made fun of him in front of her to see if she would defend him...She didn’t say anything at all about me being mean and just walked away. After a while, I felt bad for how cruel I was but didn't want to apologize because it felt like she deserved that treatment....Now they’re breaking up over something stupid and she’s still mad at me for the way I acted...Maybe I shouldn’t have been so critical...