dont think I've had enough experience of break ups to give the greatest of an opinion, but I've been in two relationships where I thought that this would be the 'one' well atleast at the time I thought that... they're both still on my mind, I'm sorta still with the 2nd but its in a ropey situation atm and I still think of the 1st girl I was with long term alot... but its no where near the same as I used to now that I realise how many people there are out there, all that really bugs me is specific memories and things I've planned to do and never got chance to before splitting... but I do think like K said its something you have to learn from experience and it seems a hard lesson and I don't think I've fully learnt it yet...

try some nlp techniques I did use some about 6 months down the line from my first long term gf and it helped alot because I found myself running the same exact few thoughts over and over so once I changed the way I felt about them and pushed them away from my concious thinking it more or less got me over it... not a permanent fix first time but if u repeat them a few times it does stop coming back they really do work....

dave x

I met up with my ex today and asked if we would be getting back together. She said no, but she still wants us to be friends. Instead of me feeling crushed (again), I feel like I've had closure on it and can just move on. I genuinely think its because I've been looking into pick up, its given me something to look forward to.

Its weird, I've felt sad for ages even when I've been laughing but now I feel normal again with a bit of optimism thrown in.

You could try displacement. Every time you think a thought about her, replace it with something else, ideally a positive memory about something else you love / do / have achieved.
Its a case of tricking your mind. Pretend the situation is different. It works in a similar way to the "fake it till you make it" method does. Ie. You convince yourself of the new thoughts. Eventually, you won't even have thoughts about her.
I'm not an expert, and its my own theory, however, this is what worked for me.

....all good and go out, approach women, get really fucking good, you will have the choice of millions of women. Even if you find yourself in a relationship, you still need to keep going, approach, get good.

Eventually you WILL be in a position where no single girl can make you mega upset. If she is REALLY awesome, then maybe you'll cry for a day or two, until somebody even more awesome comes along. The world is big, there are many women...be a man