I literally made an account to comment this because you need to hear it.
My husband proposed to me without telling anyone. He’d been planning the proposal for a while, and planned to tell people ahead of time. We had a hard week. A lot of loss and bereavement. And suddenly it blurted out. We’ve been married about three years now, just bought our own house, rescued a dog.
My MIL did not react well. There was lots of pointed comments about how we intended to marry, because like everyone else in their mid-twenties these days we couldn’t afford a big wedding, so we had a tiny wedding to avoid credit card debt. Arguments about us not providing three course sit down meals and dancing. It ended in her refusing to come to our wedding (she no-showed the dinner the night before, leaving empty seats opposite my husband where she was meant to be). We haven’t spoken to her since. There was a lot of pain and awkwardness.
We didn’t do things the way she thought they should be done. And she just wouldn’t adapt, wouldn’t let go. I tried communication and it went nowhere back then. I still wish it could have been different and she could have seen the beautiful home we’ve bought and made, helped my husband through my diagnosis of illness, met our adorable little dog. She refused to acknowledge that time, culture, society, cost-of-living has all impacted the “done thing”.
Yes, you are being unreasonable. And I hope you heed this warning.