That was great. As a manager, there's probably no such thing as an employee working comfortably and with peace of mind (that is the best), so I'm thankful that they are now watching the situation.
and! Now's your chance. There was a line of sight approach from there, so how this way returns now has a big impact. “You care, but you don't seem to notice it,” or “you noticed it while watching, you're excited,” or “his attitude is certainly a problem, isn't it?” or “Actually, isn't she (you) bad?” Or, it's a split between rabbit and horn evaluations.
If you want your boss to protect you, you must make them think of you as “a child worth protecting.” However, “I wonder if they can see through that they are about to stop?” They probably won't be on your side if you misunderstand it. The boss always protects only “those who remain.” If you quit and he stays, it's natural to protect him, because you're not a parent and child. “I'm quitting. But I want you to protect me from him” doesn't work.
People who have been working for a long time can naturally spot “people who have decided to quit.” That power is necessary in order to run the job smoothly.
So, if you've decided to quit and you're grateful to your boss, it's essential to tell them about it as soon as possible, make time to find a backbone, and leave so your work doesn't stagnate. It's a way of returning the favor to that workplace, which made me eat at least a few minutes.