I feel like I'm happy that I ruined my brothers marriage.
Why do you feel happy about ruining your brother's marriage?
I'm happy because I feel proud of myself for earning his unhappiness
You don't have to be happy about your siblings getting married but doing things to sabotage the marriage is wrong. People will think that you are mean and selfish.
I don't care. I'm happy for myself for making him feel miserable.
You should never be happy for hurting someone, especially your brother.