I'm happy that my husband's ex is fat
Why are you happy that she is fat?
I really hate his ex. She used to be so skinny that when I saw her, I was just jealous of her.
It is understandable to be jealous of very thin people but to be jealous of them for this reason seems immature. Happy that she is fat sounds equally mean too. I feel this is such a petty thing to worry about.
It's not because I'm petty that I'm happy.
You are not happy because she is still skinny so it has to be the fact she is fat. That to me means pettiness, a person's weight means nothing when it comes down to it. A person's weight has nothing to do with their character.