What if Brad Had a Soft Crush on Me?

I'm wondering if this girl is one of those girls who's very flirty without realizing it to her. Like maybe Brad had a soft crush on her and she could see it happening. And then it's also weird like that her friend would even force her to issue this ultimatum. Because what if she said, okay, it's Brad. What's plan B? It's just weird. If you don't like someone, but your friends as friends, like you can just say like, hey, might be awkward if we're in a big group. That's fair. But then she clearly doesn't hate Brad because she's marrying Brad.