What if "the one" is someone other than the one you are with?

Seriously, what if you met someone else who matches you in every way; emotionally, spiritually, psychologically, sexually. In every single way possible. Its not about lust or "the grass is greener on the other side" this is about meeting a soul mate who's intensity has surpassed any relationship you've had or anything you've experienced. The only thing is, you meet him when you are already involved.

What would you do?

Now, I'm not going to give out all the details, I'm just asking a hypothetical question.....

Steve