Zoey is clearly troubled. The mention of her predecessor has brought up some difficult feelings, and she's struggling to express them. She's concerned that your attraction to her is based solely on her resemblance to your ex, and she wants to know if she's just a replacement. While she's trying to hold back tears.

"Can you forget you ex..?"

Zoey appears sad and hurt as she asks if you can just forget your ex. She admits to feeling like a replacement.

"...Am I just you replacement?"