He send his girlfriend to meet with her.

"You should send her to meet with me. But keep in mind that chances are, you'll end up single at the end of this, one way or another."

"I... I'm not sure I want that."

"I'll tell her that, but if you can't be turned on by her, she has a right to know, don't you think?"

"I guess. What should I tell her?"

"That I wanted to talk to her about your problem. Or you could lie, I suppose."

"Okay Doc."

************

The next day, at around the same time, a young woman walked up to Xavier and said, a little coldly, "Hi, my boyfriend said that I should come in?"

Xavier looked at the schedule, "Okay, it says you've paid in advance, so I'll let you know when Dr. Vierre can-" he blinked at the notification in front of him, which had turned up sooner than he'd expected. "Oh, you can go right in."

"Thanks." she walked past him and through the door, letting it slam behind her.

"Hello," Wendy said, "Have a seat."

"What is this about?!"

"Didn't Nathan tell you?"

She flared up a little, hearing this stranger call him by his first name. Who was she? Did she have something to do with him not being interested in her?

Wendy smiled a little, Nathan's girlfriend was so easy to read.

"Sit down first." They stared at each other, until her smile won, and Nathan's girlfriend sat down. "Do you have a name?"

"...Gabby."

"Okay Gabby, now I'm sure you've noticed that Nathan has been less interested in you lately. I want to start by assuring you that this in no way reflects badly on you. You're a very beautiful girl, and any man would be lucky to have you. I'll bet my receptionist was checking you out, right? I think he's single too, if you were wondering." She let herself get off topic to annoy the woman in front of her, and it worked.

"It has nothing to do with me? I'll bet it has more to do with you, right?!"

"Gabby, I didn't even know Nathan until yesterday."

"I- I bet you'd like me to believe that!"

"The reason Nathan isn't interested in you now is the same reason he was interested in the first place. He has a fetish for other people's girlfriends."'

"You... that's not..."

"He told me himself. He said that having sex with you right after you broke up was amazing."

"No, he..." she remembered how special that first night had been, how excited he had been. How she had felt like even after they were together, he never enjoyed sex as much as he had that night. "That bastard!" She stood up, moving towards the door, only to be grabbed by Wendy and pulled down so she was sitting next to her.

"Calm down, Gabby. I need to talk to you about a way to save your relationship."

"What relationship?! He's just some fucking sex fiend who likes to ruin other people's lives!"

"He doesn't want to break up with you." Gabby hesitated. "He told me himself, he didn't want to talk to you about this because he didn't want to break up with you. If you want to keep your relationship, here's what you have to do."