The Lost Werewolf King's Mate

The second Elizabeth met Mathew, the two became best friends. Soon, Elizabeth realises she's in love with Mathew, but shoves those feelings deep down because Mathew is engaged. Through no fault of their own, they find themselves intertwined in a world they never knew existed- a magical world filled with werewolves and other creatures. Their friendship is tested when Elizabeth follows her own path in the magical world and realises nothing good can come from her and Mathew remaining friends.

Elizabeth leaves without a word to Mathew and leaves no trail behind causing Mathew to spend years searching for his best friend.

When the two reunite, their lives start falling apart again and it's revealed that nothing good can come from them being together.