It all really comes down to whether you enjoy it/why you want to do it. If you're not enjoying it at the moment ask yourself why? Is it because you just don't like flying, or is it because you don't feel as though you're getting anywhere?
If you're getting despondent at your lack of progress, ask yourself if 11 hours ago you would have been able to do what you do now. You may be surprised by just how much you've picked up.
I'm in much the same boat; I've been at it since 1995 (still only on about 40 hours), my wife has, many times, shared her feelings with me about feeling somewhat widowed (I work all hours God sends and when I'm not working I'm at an airfield trying to fly), and on a regular basis I've felt I'm never going to get anywhere, my landings are crap, I can't get the hang of PFLs, and so on.
What makes it all worth it, though, is the fact that as soon as I land and switch the magnetos off I feel like I want to get back up in the air again. Not a day goes past when I don't look up at a passing aircraft and think 'I wish I were up there.'
Not everyone has natural ability, not everyone will be going solo in 5 hours (took me 27 odd), and not everyone has the luxury of time off work and unlimited funds. Don't give up now, not just because of a perceived lack of progress learning to do something actually quite difficult in a country not at all suited to pilot training. I first really started enjoying myself when I got to circuits and found, quite by surprise, that I was capable of getting round them all on my toddle. I don't mean when I went solo, just that could see it was me flying and not my instructor. It's a realisation that creeps up on you, and what a wonderful moment it is when it does.
As regards Mrs YWIW, if flying is something you truly want to do then not doing it will cause more heartache in the long run than any hiccups over time and cost now. And as you say, she does still support you. I've been lucky, and my wife is actually very supportive. In fact when I'd almost given up on the idea of ever taking my flying any further than a PPL it was she that convinced me to say to hell with doubt and despondency, and just to go for it. I now have a class 1 initial coming up at the end of the month, I've started to book two hour lessons instead of one hour ones, as soon as I get my PPL I'll be starting ATPL g/s.
On a practical note, unless you're planning on going off to the US to do an intensive PPL course I'd hold off doing any exams until the last minute; they're only valid for one year and with our weather there's no guarantee if you start taking them now that you won't have to sit them again by the time you're ready to do the skills test.
A bit of a ramble, I know, but hope it helps
.
LB.