When I broke up with my first "serious" boyfriend, a friend of mine told me that you should take the amount of time you've been together, and divide that in half, and that's the amount of time it will take for you to truly put your ex behind you.
Now, maybe she was just telling me this because my ex and I had been together for 4 months, and this was 2 months later
but you know what... she was right. It was a couple of weeks later that I realized I was really over the "evil ex", and a couple of weeks after that, I met my husband.
At any rate, it was very cathartic for me when I scanned in the photo of him and me at my sorority's formal (best photo I had of me at the time) and oh-so-carefully snipped his face out using Photoshop <g>
You need to "mourn" the failed relationship for a time - especially if it was your first serious one. You need to eat the pint of Ben and Jerry's (I recommend chocolate chip cookie dough) and cry on your best friend's shoulder and listen to sad songs. But life goes on, and so must you.
To everyone getting over a breakup - hang in there. It *does* get better. "Remember, it's always darkest just before they turn on the lights."