She didn't actually want to do it to hurt him, or even to be a bitch to Heather, not really. If she honestly believed Heather was right for him as she once had she wouldn't have said anything. But Sam was hurting, and for reasons she still couldn't fathom she didn't want that for him.
"Is she happy when you're happy, or does it not work both ways?, because you aren't happy."
Something she needed to get off her chest? Because she didn't have enough support already, she was selfish to the point it annoyed Ruby who sometimes wondered if the woman actually knew how many people she was pissing off with this bullshit.
"Just remember its about you as much as it is her, and from where I'm standing you're there for her, advice, caring, defending her against every outburst she has. Can you say she does the same?"