Not sure which one is the worst decision........getting married or starting flight training.
But of them one will make you happy for the rest of your life, the other will put a smile on your face for a while. You need a real long term comitment with no garentee of success. There are a number of young guys with access to endless amounts of cash that will be in direct competition with you. Can you afford to spend a year not earning and go fly something for peanuts to get the experience you need for a few years after that? You could be looking at three years of hard times followed by a job where you're expected to locate yourself near to a base (that probably wont be around the corner from your current house). Your best chance will be in the private jet sector and that could involve staying away from home during your rostered days at work. If your wife to be is still with you at that point, you'll probably Love it and not regret a thing.
It's a great job and those of that do it are indeed the lucky few. Only do it if you can afford to fail. ( in finacial terms ) and still get on with your life after