I have seen women present with hugely ulcerated breasts from breast cancer that had been growing for months. Asked why they had not sought medical advice earlier they would respond that they had hoped it would "just go away". Delay guaranteed an early death. I could never understand it.
There are people at the opposite spectrum: "I sprained my wrist 3 weeks ago. I am still getting the odd twinge. No, it's not painful really. Yes I can move it fine. No, I haven't hurt it again. Why today? Oh, I just thought that I'd make sure, you know, that it's nothing serious. It's fine? Really? Ok. Thank you so much."
People are entirely without logic.
School teaches us about science: Newton's laws, organic chemistry, Ptolemy's triangle. School misleadingly teaches us that things are explicable. People are not explicable. Still, we seek to understand others in the hope that they are less muddled than ourselves.
Apropos relationships: candour actually does work.