I really feel for you mate, I was with my ex for 6 years and she moved out whilst i was at work one day and left the house looking like it had been ransacked. 18months on im feeling better but it still gets to me from time to time, friends and family got me through it, moved back home and have finally got myself sorted financially and looking forward to the future now. Keeping busy and being around people you can trust as much as possible would be my advice. good luck.

Edit: Oh and I should have also said that I tried keeping in touch with her for the first year and it didnt help me at all, ive cut contact with her completely and things are alot better for it.