Way 1 · best default
I'd better get going
The everyday way to leave. You make it about your time, not about them.
Examples
Anyway, I'd better get going or I'll miss my bus.
It's nearly six. I'd better get going.
In a conversation
A: ... and then the plumber never even showed up!
B: Oh no. Listen, I'd better get going, but good luck with it.
Common mistake
Not: I must go now.
Say: I'd better get going.
"I must go now" sounds sudden and stiff. "I'd better get going" sounds natural and kind.
