But how much does he spend on his girlfriend. :)

Ray Dalio, in his seminal series Principles for Success (8 videos totalling under 30 minutes), said that all he needed was a roof over his head, and food to eat. Of course, he was a risk taking entrepeneur. But how much more than that, do we need?

Of course it largely depends on goals. Mine has been financial freedom - since I was 30 or 31.

I similarly moved to a cheaper share situation, cutting $400/mo, stopped eating out ENTIRELY (including lunch, I'd bring my own sandwiches), paid off my worst credit card with a tax refund, bought a 6-year used car when I needed one... I was making $70k/year at the time, and went from having $100 net at the end of each month - by budget, to applying nearly half of my take-home page toward amortization of debt. While still paying myself 10% first - which was able to increase once I was debt free.