1) Focus on the bad side of the relationship
When things end, it’s pretty natural to romanticize the relationship and look at it through rose-colored goggles, not unlike the NAR tends to look at the housing market. If you force yourself to think about the things that were wrong about the relationship that you’re NOT missing, rather than dwelling on what you are missing, it may help
2) Re-focus on friendships, hanging with “your boys”
There’s a good chance that there were things you like to do that you didn’t have time for while in the relationship. You want to spend time around single guys, who tend to have similar interests and time availability as each other. Good guy friends don’t let each other mope over relationships, and being social is important.
3) Cut off contact with the ex in the short run
You need space until you resolve your feelings. You may be able to be friends in the future, but now is not the time
4) Focus on other options
Your milage may vary depending on your own personal beliefs, but flirting with, making out, or … more with another woman is often the quickest way to wash the pallette clean. You want to look forward, not backwards.
It’s cliche, but there really are a lot of fish in the sea. She wasn’t the One, so why waste any more time on her?