It's because she loved him so much that she did it. She new what she was doing wasn't right and didn't want to inflicked the same ハート, 心 ache she felt on someone else によって staying with him
Well, that's the thing: she loves him. She knows that he's in 愛 with Victoria and she knows that he'll be happier if he's with her. She cared もっと見る about him than herself, which shows that she truly loves him.
I think she gave Victor up because she knows what it`s suffer for 愛 and she knows that it`s not fair taka away Victor`s life because she 愛 him. I think it`s ok that she gave Victor up. It`s so good on her personality...
I agree with everyone that it's because she loves Victor and couldn't くま, クマ to see him suffer and be miserable without his true 愛 victoria,because what's the point in being married to someone who doesn't 愛 あなた back.
Besides there's a saying that if あなた 愛 someone または something, set it free, because one 日 it may come back to あなた if あなた let it go. Emily loves victor and victor gave her her happiness back. So i guess that's why she let him go. And why i 愛 emily so much. Tim バートン is indeed a legend in the film work, right along with Wes Craven.