Echooos has good advice, I would add seek counseling, if you are experiencing any depression. Also take your time as you re-enter the dating world, try group dating.
How do you get over an ex that you constantly have to be seeing and loved dearly?
I've alway heard the best way to get "over" someone is to get "under" someone new ... I don't know if I'm allowed to say that on here or if it's good advice , probably not on both points , but I said it anyway :p
You find different places to hang out with and make new friends that don't know or at least don't hang around that ex. In other words, you move on.
Don't make things complicated by over thinking.
Be strong and accept.
If possible try dating another person, it'll help you to forget.
Be happy,find positive and negative points of that relationship. :)