I would be embarrassed if I was Goldie
She is literally afraid to get married thinking that it will ruin her relationship. So instead they say they don't need it.
I have been married for 44 years and can't conceive of living that long with my man and having a child and a home and not saying I DO and forever.
So what if you say it in private? If you are not willing to say it in public for the world to hear, then you have no confidence in it.
I am sure they are deeply committed. And yes many people get married and fail at it, many times.
I applaud them staying together. But the couples who finally say I do, after many years say that it adds something else to the relationship that was never there before. And they didn't miss it because they never had it.
If you have to explain marriage to someone, you know they have never been married.