It can! I don't know if ex is really the right term but he's referred to as her ex quite a bit in the last few books, though they were never official. It was a "we can be together after you graduate" thing, then he got turned evil. At the point she's from, she was hunting him down to kill him (holding the belief that it's better to kill him and free him)and when he's from is after he was turned back to good, but he believes that he can't love anymore, like part of the evil vampire is there taking away his ability to love. It's sad lol.