Perhaps he was acting fine - valuing your relationship & knowing he'd got to be "nice" to keep your love - but at his age I don't think peoples' characters suddenly change.
Its more likely that the stuff around his mum has made it more difficult for him to hide his true self.
And anyway, when you've just lost your mum, the loss is the big thing - the fact she wasn't some "perfect" wife, but had an affair (in who knows what circumstances?) - difficult to deal with , yes, but she's still the same person & surely a well-balanced person would still greive for her as that person.
Not suddenly become twisted & start taking it out on his own partner?
The Government advice re emergency packs
Thomas Markle Snr. being investigated for child sexual abuse images.

