I had a close group of girlfriends from college, we had considered each other our best friends. We travelled together during our early 20s and even made sure to meet up once a month after we graduated. One of my "friends", Diane, got engaged to her longterm boyfriend and their wedding was a few years back. I attended the wedding with my partner, and we gave a cash gift ($400 - I considered her a best friend). We put the envelope with the rest of the cards while we were in the receiving line at the reception.

Almost immediately after the wedding, Diane stopped responding to my text messages and ignored me in the group chat. She skipped a few events I was hosting, and when I asked her if there was something bothering her because she was so distant, she came up with some gaslighting bollocks.

About 6 months after Diane's wedding is when she and I had a bit of a blow up, where she finally revealed that she was mad at me for not giving her a wedding gift. So she lost the wedding card, assumed I didn't give one and decided to cut me because of it.

Anyway, another one of our girlfriends is getting married and had a celebration this past weekend. Diane literally arrived wearing a white dress and white blazer.

Honestly, I'm so glad she's out of my life and I feel bad for how she's going to behave at this wedding in the future if she can't even stay away from white...

Edit to add that in my culture you don't wear white to any wedding event unless you're the bride - it's considered tacky