Answer:
In, "A Modern Love Letter," the author shows that Bella is a reliable narrator when Bella admits she is embarrassed when Mateo finds her following him.
Step-by-step explanation:
Bella exposes her true self by saying how does she really feel toward the situation, then she is being a reliable narrator, some of the characteristics of a reliable narrator are that they are accurate and impartial, they are principally honest and communicate their ideas and comments in a clear and trustful way.