Given two choices, humans will almost always choose the one that serves their own interest best.
It’s nothing personal, but we tend to skew things toward our favor. Often without much thought.
The problem is when we play finite games. If we are playing to win, if we are playing to raise our status (and lower someone else’s), negotiations will inevitably stall.
In a world of where we “split the baby,” no one wins.
Maybe worth considering to take less and leave more on the table. Someone doesn’t have to lose in order for you to win.