She split from her BF at Christmas-mutual-agreed to part.
She is moving on and is happy but has to contact him at times due to work.
He has a new GF.
All should be okay but he has started rubbing her nose in it as to how fantastic newGF is. More worrying is how he's saying wish I'd never met you and other very abusive comments.
Why would he bother?
Immature but why?