Liz had left. And you were devastated. Your girl was out there in the world roaming about alone. Without you...You thought of her night and day. Missed her on missions, worried about her dating normal guys, bugged the Professor to try and get in contact with her.
And when she accidently burned down a building in her sleep and was sent back to the BPRD compound...you celebrated. Obviously you were sorry to hear she had an unpleasent episode with her powers...but you knew normal life wasn't for her. She was a freak like you...and she belonged with her own kind. With her family.
As you trail after her in the hallway she gives you a dull little frown and shakes her head. "I'm just staying for the weekend. I just need to get a handle on everything...Don't get too excited, Red."