'What a puppet thing life is' means that 'the course of life is determined by pure chance'.
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.
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.
