Hi Kyle, firstly I would encourage you not to believe all that they say - this is one of the DB rules for a reason and WAS's may say many things that don't ultimately come to pass. However, if that she has said this helps you detach further - great - though I wouldn't let this alter your course.
I'm also in the UK and my XH filed on unreasonable behaviour grounds. From what my L said, the bar is pretty low. To avoid further hurt for me and help him out, I ended up giving him some suggested grounds and he used those. With the benefit of experience, now I probably would have taken a harder line and said to him - well, I guess if you feel I've behaved unreasonably you'll file on that basis - then left him to it.
But there we are, it's not a huge regret and we live and learn. Do take some time to absorb this latest development, which is by no means the end.
Take care
T 13 M 7 Me 48 H 46 SS 15 BD 7.14 PA D final 5.16 (H filed)
We receive & we lose, and must try to achieve gratitude & embrace with whole hearts whatever of life that remains after the losses - Dubus