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I wouldn’t want to get in between you and your significant other, but you should know the truth.
This idea that you mentioned as the reason for covering hair is not nothing – actually if I’m not mistaken R’ Samson Rapahel Hirsch suggests it in Parshas Naso.
However, the Shulchan Aruch paskens that even an unmarried woman must cover her hair! Therefore according to the psak of the Shulchan Aruch, it is obvious that this cannot be the true reason. Why no one seems to be makpid on this today is a good question, but is beyond the scope of our discussion.
So what is the real reason? Good question. But the way halacha works is that since it’s so difficult to actually figure out reasons for stuff and be so sure about it, we first figure out the technical details, and only then speculate as to the reason. And the reason so many rabbis allow for women to wear a wig is because technically it is sufficient, and we have no real, legitimate reason to tell us that it isn’t.
Listen, the details of the halacha are sometimes very technical, and they work within a system that someone who is not a rabbi really isn’t qualified to decide. Not because the rabbis have special powers. Simply because they know all of the details. The halacha isn’t simply determined by the feelings we have while listening to the Torah reading or discussing the parsha at a kiddush. It’s like any specialized field – I’m sure you wouldn’t consider deciding on your own which prescription drug to take (I hope). That’s why if I could offer you any advice it would be that to agree upon a rabbi that you decide to rely on even when you don’t completely understand. It’s the right thing to do, and trust me it will also bypass lots of potential disagreements because halacha questions won’t be up for discussion. And just know that rabbis are nothing to be afraid of. A rabbi knows who he’s talking to and cares about you and will tell you what he thinks is best for you, and he won’t make you do something you can’t. Do a little research, and you’ll find the right one for you.