the deal-breaker

How do you define the limits for a relationship?

How do you know when to let this particular oddity slide or decide you simply cannot tolerate it? I know some people who have a thing for religion - they have to share the same faith with their partners. Others can accept their spouses having an affair as long as the said spouse comes home every night, but refuse to live with the in-laws (or have the in-laws live with them).

Personally, I think it's just a matter of weighing what matters most to you. Do you go for fidelity above all else? (I know I do.) Can you live with the fact that you partner will never be as romantic as you want him to be? (Hmmmm...)

So, yes, I'm asking you - what's your deal-breaker?