Would you be with someone who only wanted a common law marriage to you?

My girlfriend wants to get married. And I told her if we'd met 30 years ago that'd be a definite possibility. But I simply have too much to lose asset wise now and she's simply too big of a risk. Why is she mad about this? Doesn't she get if she has substantial assets this protects her to?

Would you be with someone who only wanted a common law marriage to you?
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