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.
Explanation:
A “reliable narrator” is accurate and impartial, it is principally honest and communicates in a clear and trustful way. When Bella admits her feelings she is showing her inner self which makes her trustworthy and reliable, it also shows the good nature of the character as her honesty al clarity of thoughts, the reader can always believe what a reliable narrator says.
I think that it is common in some parts of the world (Parts of the middle east for example) for people to disagree with the idea of boys and girls receiving the same education. Though in the western world I think it is very uncommon.