Final answer:
Hector's proposal before graduation exemplifies the predictability-novelty tension, as it blends the desire for relationship stability with the embrace of life changes after graduation.
Step-by-step explanation:
The dialectical tension illustrated by Hector's proposal to Alex just before graduation is predictability-novelty. This tension arises when individuals seek a balance between the comfort of a stable, predictable relationship and the excitement of new experiences and changes. Hector's proposal aims to secure a predictable element in their lives amidst the uncertainty and potential novelty of the post-graduation phase. This action addresses the inherent desire for both stability in a relationship and acceptance of upcoming life changes that are unpredictable and new.
By proposing, Hector introduced novelty into their relationship while also seeking predictability and stability through marriage.