Re: Chronic Flake
As for handling her flaking behavior, check out this recent post here. A lot of it ties to value, which was already mentioned so you are aware of that.
As for handling a relationship. Literally have a list of qualities that you absolutely need in a woman and don't stray from it. No exceptions. For me it was things like; no kids, close to my age, not damage, ambitious, not a party girl, etc. And I still dated women who had these traits I didn't like. But my list dictated how serious I got with them. You have to look at these women that you CANNOT change them. Never try to "save" or "fix" them. My most successful relationships have been with women I didn't feel like I needed to fix.
If you feel like you can change her, you may find yourself in one rocky relationship for a few years because you keep hoping you can eventually control and/or tame her. It really just brings you down as a man of value. And you eventually get out of the relationship a beaten down shadow of yourself asking why you spent so much time on someone. Wondering how many high caliber women you let walk by while trying to fix the one you were with. Hope this helps and good luck.
"All things are subject to interpretation. Whichever interpretation prevails at a given time is a function of power and not truth."