Any tea on Hrithik - Sussanne 2010-2013?

I was watching the KWK episode with Hrithik and Sussanne in 2010 and realized they separated a few years later. I wasn't really following Bollywood much in those times and wanted to see if anyone can provide some info on what happened in the specific time period of 2010 -2013 to precipitate a hasty divorce. I'm aware of alleged Hrithik affairs and Sussanne affairs - not looking for that. Or the drug allegations. There seemed to be problems on both sides. Was wondering on a more personal front, what happened.

They had little kids at that time and I feel like affairs are v common in the film industry and do not by themselves lead to the end of relationships (though they might). I wonder what led to Sussanne actually moving out and going through with a divorce. It doesn't seem like she's doing all that well now. I know Hrithik had brain surgery in 2014 and she wasn't really there (!!). Any tea?