After the Goldsteins help save him, Graves is a bit protective of them. This means that, whenever anyone makes any unwanted advances towards Tina, they're going to end up in the hospital. And when Jacob starts remembering and going out with Queenie, Graves is going to drop by his bakery for a good old shovel talk. And when Jacob gives one right back, Graves knows there's no way he's letting this muggle get obliviated again.