During our marriage when I was upset and even when I discovered exH with an OW etc, I was NOT allowed to express any emotion without being called a 'nutcase'.
This sounds familiar SP.
I remember telling my MIL 14 years ago how devastated I was feeling about my lovely Dad's death - and on the other end I received - silence! I couldn't believe it. Assumed she hadn't heard me. Repeated myself - and received - silence! It was then that I realised that this woman was not capable of normal anything.
A few months after BD, my H was travelling with the OW and hid her at the local shops while he visited his mother for an hour. I phoned my MIL to see how the visit went, and she insisted he was completely normal. I said, yes I realise he is putting an act on in front of other people, but this is what the boys and I are experiencing, and it is so out of character for him. Something is not right.
She said 'oh you've ruined it now. I'm a lonely old lady and I had a lovely visit from my son'
Needless to say things have not really improved between us since then, even though I was a massive support for her when her youngest son monstered at her a few years earlier (MLC I now realise, although he didn't have a family to upset - aimed it all at her).
Toxic, toxic, toxic - stand well back.