Most of the writing that we come across in Love in the Time of Cholera is in the form of love letters, but interestingly enough we never read a single excerpt from one of those letters. No matter – their content isn't what's important. Instead, the other ways in which we can read letters take on a greater importance. Handwriting, the scent that perfumes the pages, the manner in which they're delivered – all of these elements are signs that can be "read" by the characters. The very act of sending – or not sending – a letter sends a message, regardless of the contents of the envelope.
Florentino's status as the most prolific writer in the book makes him the most central character of the novel, and thus the character whose perspective most closely aligns with that of the author himself.
Florentino's inability to write in any other style besides romantic verse is indicative of his limited understanding of the nature of love as a purely romantic emotion.