Such a shame
Indy, her manager and Wim made agreements to work together this year after a few months trial run at the end of last year. So obviously Indy felt good about Wim as her coach.
But something better came up for him I guess
Halep had a great year last year and just entered the top 10, so that's a nice challenge for him (and probably a bit more $$ as well).
Hopefully Indy can find a new, good coach soon who can help her take that next step (and work on her serve/DF
BTW I heard Thomas Hogsted is available