My BESTIE Talking My Man Out Of Marrying Me – Leo and Rebecca Buzz Question

Leo and Rebecca Buzz Question - WHY is my BESTIE Talking My MAN Out of Marrying Me??? WTH...The other day man man says they they talked and he feels like she was trying to TALK HIM OUT OF MARRYING ME....Wow..totally didn't see that coming...How would you handle this and why do you think she is doing this????