you know it's near when she starts to question her feelings for him!!

Well, she’s not exactly questioning her feelings in a way that shows she might get over them. It seems to me that she’s jealous of what they have and part of her probably wanted them both to need her in the way they have needed her so she’d be relied on. She probably also hoped they would continue to drift apart deep down

Yeah it felt more like that feeling you have as when you see two friends are closer in a three friend group