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If you can turn the wrench with all your might and it doesn't "open up" to round off the corners, tap it with a hammer 3-4 times(tap, not slam) it should free up just fine.
I have an old open ended wrench that is much more stout than any flare nut wrenches or other open ended wrenches that never fails me. I can send it down if you like. PM an addy.