movie for a confused girl

My girl is thinking of leaving me for another guy.

It's a long story, but let us just say I think she is caught up in the moment and is not thinking about all the love we have shared.

What is a good movie for making people think about the long-term consequences of their decisions, and not just the moment, in terms of romance, relationships, love?

I just watched Click for the first time, and that really hit home as far as all the bad decisions I have made in this relationship. But she has already seen it and I just watched it so that doesn't work.

I am ready to let her go if that is her choice, but it doesn't hurt to try and save what we have.

Edit: I appreciate all the relationship advice guys, but the situation is not as simple or straightforward as I can summarize in a few sentences. I'm looking for movie advice, not relationship advice.