Final answer:
David was upset with Stevie because Stevie forgot to complete an important task they had agreed upon.
Step-by-step explanation:
David's frustration stemmed from Stevie's failure to fulfill a crucial responsibility they had discussed and assigned to Stevie. This failure likely resulted in inconvenience, disappointment, or consequences for David or their shared project. The overlooked task might have been vital to the progress or success of their work, leading to David's disappointment with Stevie's oversight.
Such lapses in fulfilling commitments can strain relationships and partnerships, causing emotions of disappointment and frustration. In this context, David's upset could have arisen from feeling let down or inconvenienced due to Stevie's oversight.
Clear communication and meeting expectations are crucial in collaborations, and when one party doesn't fulfill their end, it can lead to disappointment or irritation. Understanding each other's roles and responsibilities is fundamental for smooth cooperation.