YA Fantasy about guy named possibly Owen or Oren who falls from a cliff to save his girlfriend towards the end and then has memory loss & doesn’t remember their relationship. Read around 2013.

[Jackie]

YA romance about a guy I believe named Owen or Oren. I think he comes from money and has girlfriend. Towards the end he saves his girlfriend from falling from a cliff & falls himself into the river. He ends up surviving but has memory loss and can’t remember her. I read this around 2013. And I believe it’s a standalone series. I think he has dark hair and green eyes and she might be a blonde?

[Becca]

In the header you say it's fantasy - what are the fantasy elements? Is it set in a fantasy world? It might be on this YA Fiction Featuring Memory Loss list.