Woman: Haven't you heard? I got fired last month.
Friend: What happened?
Woman: I snapped at a customer. He tipped me two dollars, and I don't know why, but I'd just expected something more. So I completely lost my temper and started yelling.
Hi. Is "I'd just expected" grammatically correct and natural here? Is the tense natural or would the simple past be expected especially together with "just"? Also, does "just" seem natural to include?
Hope anyone can help me. Thank you.