Just like a hen, an eagle too sits on its eggs waiting for them to hatch. Some hatch a little faster than others. After a while those that do not hatch, the eagle sits on them a little longer.
At some point, as it has to provide for the ones that hatched with food; it flies away, comes back, feeds the young ones and still sit on the eggs to see if there will be any difference. When it sees that there is still no change after all the efforts it has made, it gives up and moves on with the rest of the eaglets letting go of what could not become.

The hardest thing in our lives is to figure out when to give up; giving up on that business, on that relationship, on that venture.

At times we are conflicted with the ‘maybe’, maybe if I put more effort in it…, maybe if I invest more in it…, maybe if I put more time in it…

It has to reach a point where you draw a line, and say you have nothing more to give and move on to the next thing.

The eagle had figured out that there was nothing wrong with her. She had witnesses, the hatched eaglets that proved it. It wasn’t that her heat wasn’t enough. Even with the extended time, still nothing happened!

https://www.itrendnaija.com/2019/09/its-over-when-and-how-to-say-enough-is-enough.html?m=1

When thinking about your SO brings dread to your mind, and if you're always looking for ways to spend time AWAY from your SO; it's time to move on.