Of course it's easy for me or anyone else to say just YOLO and that you should just go for it, but as you've gone through so much detail to explain the situation and it has been clearly chewing you up, just fucking do it, man.
Sure it's a decent chunk of change, and it'll no doubt piss her off, and maybe I'm overstepping the line as I don't know either of you but fucking hell does she not have any hobbies that you too are confused by? Football is clearly a huge part of your life, and not everyone will understand that, and that's fine, but to leave you because you want to experience perhaps a once in a lifetime opportunity and a huge moment in your club's history is fucking befuddling to me. Especially considering the shite you've had to endure.