So, as Maggie pointed out, it takes longer to learn the basics of leading than it does for following. So the fact that your spouse is learning faster at this stage is not surprising or unique. I have to say that her response to the situation is not very sporting, but maybe there's more to it. Here's what you need to do:
* Take one lesson a week on your own. And by "on your own", that means your spouse is not at the studio and is not watching. Do this not because you are trying to "catch up", but because you need some instruction that is focused solely on you and your understanding the lead role. You need to gain some confidence with the role, and to do that you need some time where you aren't worrying what your partner thinks about it.
* Dance with your spouse at milognas, but for the moment don't worry about what she thinks of your dancing, as long as she's willing to dance with you. Spend some of your time trying to get dances with other follows at different experience levels. Try to get far enough along so that at least one or two of the advanced follows will dance with you now and then, but don't focus exclusively on them.
* Spend a bit of time watching those advanced leads at milognas. Pick out one or two things that you know are areas where you need improvement, and watch how the advanced leads do it.
As newbie points out, follows hit the wall later, usually after a couple of years, and it happens at a time when leads of the same experience level are improving rapidly.