Tough situation dude. This is a good reason to set up this rule early on in a relationship: It takes two to "yes" and one to "no". Basically, we both have veto power for anything. It's likely partly responsible for the reason we never fight. If one of us doesn't want something, we still debate it, but at the end of the day we both have the option to say "no" to pretty much anything.
It'll be very hard for the OP to institute that rule now (during a disagreement), but it's probably a good one to start after they're through this.
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