I'm not so sure on that rule. It's not like I experience a set time period of grief after a relationship ends that's half as long as the relationship lasted. It usually comes in waves. A bad week, dreams or even a certain smell might trigger a moment of grief that could last from minutes to weeks. As time passed they happen less frequently, last less time and have less emotional impact but they still happen. I wouldn't suggest that it's out of the ordinary to be having these feelings if they are occurring 2 years after the end of a 1 year relationship.
Different people will move on at different rates and that's okay. Just do your best to keep yourself healthy (mentally and physically). If you are struggling with moving on and you think it's actively harming your health it is crucial to seek some form of therapy however.
If this was a highschool relationship my advice would be to just wait. I was devastated when I broke up with my highschool sweetheart but every year it became less important.
Breaking up is something you learn to do just like anything else. In my case I found out the person I grew into isn't someone the person I was seeing would have loved and the person I am now isn't someone who would love the person I used to date. Now all the emotions I had and all the things that I thought were important seem trivial
Hope this helps, and don't stalk it makes you weird and everything you're experiencing worse.
When the shit post is agenda post 😔