Regular registered poster, with anonymous post here. Take this from me as a recent graduate from this school (who should have listened to other graduates.
Claims she doesn't love you? She has plans with someone else and too embarrassed to admit, and/or admission will work against her.
Wants to stay in house? This won't be forever, she wants to transition out, but still wants you to pony up the dollars.
Your 73% is a give away, like my ratio. It leads to you pleasing her all the time, she spends more than what she earns, or as in my case the combined spend (mostly her non essentials) comes up to or goes over (onto mortgage) of combined salary.
You love her, but start complaining about the spending. She finds that 'un loving' as her girlfriends all spend and take holidays etc, and she doesn't. They tell her to leave you, but they are unaware of the salary imbalance---you are now the arsehole.
She finds an option, thinks she will somehow start earning more because she has been told you are holding her career back.
She will find out reality when its too late.
Take it from me. Nothing will change her mind, she has already enquired with lawyers etc. Play your trump cards, like I did.
Excess money on mortgage (eg offset account) should 'disappear' and your mortgage itself should be at maximum. You can return that to mortgage later when settled.
The house value should be as low as possible. In this case with the house on your name its even easier. Start a renovation you have put off, something aesthetic or better with some space benefit. Break down for renovation, then leave it unfinished (even though you have costed and have plans).
Give a low ball offer to her on house split. If she disagrees say you will sell it in fire sale, and buy it yourself so she should take it.
You have 73% of salary, mortgage on your name, you will get finance. Then put the disappeared money back in, complete renovation and increase the value over its current/original value
You would be surprised how much money your salary can buy after the split.
My wife had every opportunity to make money, start businesses or work for good salary, but she wanted to indulge her work as a self employed hobby, not care about how much she makes. (She was by no means lazy). So every venture was funded and borrowed for. When the tap gets turned off, and you get older and look at where you are, you start reigning in too late. Now you are the A-hole.
Get out, be happy, but take what's yours, because she doesn't really care about your future. Her mind is elsewhere already.