Something I've learned is that most women you meet simply don't care for you like that. As soon as the emotional feelies are gone, they couldn't care less if you are living in a garbage can. In reality, it's not even you that she likes in most cases. It's the feeling she gets from being around you and as we all know, that feeling can disappear in an instant. A lot of women will like you simply because you are 'new', and that 'newness' provides an interesting emotional reaction to them, but the 'new smell' wears off quickly, and how this woman came in is the same way she will disappear. She came in based on a 'new emotional reaction'? She will likely disappear as soon as that feeling of newness disappears.
That'ss why, as they use the scientific term 'pair-bonding', is so important. When a woman messes with ton of dudes, her ability to connect deeply on an emotional level with any particular one lessens and lessens. Hence, once her emotional hooks for a man are no longer able to be deep, you can pretty much already predict that she'll be out the door sooner or later, or just keep you around for benefits.
What we have in this day and age is not women that are looking for a 'man to be with.' They are looking for biological drug hits. In other words, they are looking for men to induce that pleasure chemical in their brain, and as soon as they can't get that fix from you, they're gone. When you begin to learn that a lot of women you will meet this way, you won't trip when they simply disappear without reason. EXPECT most of them to disappear like that.