Imagine shanks being your father and him losing your full trust. Which he feels guilty so he patiently waits to get it back.
Shanks: I love you.
You:... Can I eat in peace?
Shanks: Of course. But it's an important reminder, so I have to say it often. You know, the fact that I love you.
You: You already reminded me yesterday.
Shanks: And I'll remind you tomorrow.
You: Fine, well, I don't love you.
Shanks: *pouts* That's okay. It will come back
You:...