It can really be hard to get over the loss of a partner. The best thing you can do is
1.) Not talk to them for a while. It is hard but it helps.
2.) Stay as busy as possible. No matter how hard it is go out with friends, work late and just try to rebuild your own life.
I know you can do it and if you need to talk, we are all pretty nice people who know how you feel and will never judge you.
In the United States today, there is a pervasive tendency to treat children as adults, and adults as children. The options of children are thus steadily expanded, while those of adults are progressively constricted. The result is unruly children and childish adults. ~Thomas Szasz