Elves don't cheat on each other. Ever! They are bonded for life and it's only very rare that they leave each other. I can only think of two as a matter of fact.
Tolkien stressed over and over again that Elves have only one mate for their whole lives. Cheating is somewhat far-fetched and you might really want to explain why Talathiel would do something like that.
Make sure to proof read your work. There are some errors.