is it true what they say... :(
I've had a situation in the same ballpark as yours, kinda. My story would take too long to write out so I'll just say this, I was in a relationship that couldn't have been better, lasted 3 years, I felt she was the one, etc, you get it... then just before the 3 year mark it ended suddenly by her / mutual breakup / supposed to be temporary, blah blah, etc. (too much to write)
Anyway, it's been 1.5 years since we split and I haven't even thought about replacing her, infact, I'm still mourning and try to begin to recover. So that's my recommendation, take as much time as you need, be true with yourself, in that if you want to mourn, mourn. Don't be fake, be for real. Then you take things at your own pace and when your ready to shop for girls, it's all up to you.
2004-2010: '04 WB Mazda 3s Hatch
2010-Present: '06 GMC Envoy Denali Sport 4WD