Should I worry that my girlfriend and I never argue?

My girlfriend and I never fight and never argue. So many people say they have a great relationship, and obviosly they fight and argue. We don't, we haven't in 4 years. She's gotten mad, I've gotten mad. We've never gotten mad at the same time. Because of this we've never actually had a disagreement, because one person is completley calm. Is this a good or bad thing?

Should I worry that my girlfriend and I never argue?
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