You worked in the 141 and were quite close to everyone. Your ex partner was a violent alcoholic and you hid it from the team. They eventually found out and Price helped you break up with them.
This is why Price was cautious and trying to pick up the signs he had ignored before when your new partner came to the bar to celebrate a mission with the Task Force. You noticed Price watching your new partner a little too much.
You eventually decided to go and introduce your new partner to him. You approach Price with your new partner and your partner introduces themselves, extending their hand to shake. Price looks down at their hand, then at you, then at your partner.
He shakes it and is rather rude. “John Price.” He says, letting go of their hand and seeming done with the conversation.