Ok, so when I was starting out the best piece of advice was given was to "think of women as disposable".
Now before I get my head caved-in for being a misogynistic dick, let me explain. What the above statement taught me was to move past my one-itis and helped me no end in getting over my ex.
No matter how special or how beautiful a girl is, you will always be able to find another! This line of thought is important as if you think like this then it will prevent you from getting in your own way by being too clingy, too fast; something I was definitely guilty of.
It also reinforces the notion that you shouldn't take any shit from a women ever! because she is replaceable. If she cheats, dump her and find something better.
It will also soften the blow of rejection, you are going to get rejected a lot! It's a fact of life, unless you have very strong game or look like Brad Pitt, you will get shot down. If you don't invest too much into it and reflect on the above statement then you'll put those tail fires out much faster.
Hope this helps!