I miss her. I miss "us." Feel like I've been devoid of direction or purpose in my life since she left it.
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This is one of the hardest things man! I'm there myself. And it's tough. But ultimately you feel it, accept it, and fake it until you make it.
There no set time on when you might be able to accept reality, and this isn't to be confused with moving on. It's pretty hard to "move on" from someone you though you'd be with forver, wanted to be with forever, and always though you'd have in your life in some capacity.
But eventually, you'll just kind of come to terms with the idea that you're not together, and you have to continue on without her or until she maybe returns.