I had a similar thing happen to me the other day. As someone who has had relationship problems, I was thinking I was being stalked by someone I had known in my past. Turns out it was google being google, and making people feel like their account has been fished.
It might be a good time to ask then if there are good email alternatives to google. I already use Riseup, which is very good.
But I’ve heard email in general is inherently insecure.