In order to "move on" you have to "let go".
The first thing you have to do is accept it's over!
As long as you hold out hope of reconciliation you'll never move on.
The next step is to keep things in perspective.
There are over 7 Billion people living on this planet! That person whom you feel you can't live without just know there are billions of us have doing exactly that every single day! In fact you used to be one of us! There are bound to be many future mating opportunities!
In order for your ex to have been "the one" they would have had to see (you) as being "the one". At the very least a "soul-mate" is someone who actually wants to be with you! (And vice versa).
Avoid the tendency to "romanticize the past".
Spend time with friends & family who are supportive, Get back to treating yourself well including working out, getting back to participating in hobbies, goals, and other interest you may have neglected while in the relationship.
Essentially that means cutting off all contact with an ex, unfriending them from social media accounts, putting away gifts and photos, deleting phone numbers, blocking email addresses, avoid going to places they frequent...
Forget about being friends. The best friendships between exes generally occurs after a large gap in time allowing both people to fall "in love" with other people. Going from being "red hot lovers" to "instant platonic friends" is unrealistic. Generally speaking the person who dumps someone offers friendship as a "consolation prize". This helps them from feeling like the "bad guy". Unfortunately the person who gets dumped oftentimes views the "friendship" as a potential to eventually get back together.
Sometimes matters are made even worse if the couple has sex again. While one person sees it as being a "booty call" or "friends with benefits" the other believes they are once again "seeing each other". They set themselves up for being hurt a second time or feeling used when they understand the truth.
When you're ready get back out into the dating world. You may want to research some online dating sites or consider joining some hobby/interest groups on Meetup.com. Remember you're not alone.
Truth be told when it comes to dating and relationships most of us (fail our way) to success! Very few people hit a homerun their first time at bat. Every ending is a new beginning!
Your future lies ahead of you and not behind you!