My manager told me to resign before the announcement. I know why now.

A week before the layoff announcement, my manager called me into a one-to-one and told me — off the record, she said — that things were going to get difficult and it might be better for me to start looking. She didn't say layoffs explicitly. She said "difficult." I asked her directly whether she was telling me to resign. She said she couldn't advise me officially but that she cared about my wellbeing. I didn't resign. The layoffs came. I was on the list. I got severance. The colleagues who had resigned in the two weeks prior got nothing. I think about those colleagues. I don't know if their managers gave them the same conversation mine gave me. I don't know whether it was coordinated. What I know is that "I can't advise you officially" is not the same as "I'm not advising you."