My wife has moved out. How do I get her to love me again?

My wife is 30 and I'm 38. We have 3 children, a 15 yr. old and twin 3 yr. olds. She told me sometime during the summer that she was not happy and needed to leave me. What do I do? my whole world has fallen apart with her leaving.
My wife says that I have issues with yelling and self-control. I snap when I shouldn't and take things personally that are never meant to be.

There's more to it than all of this, though. It really is that she didn't feel appreciated the way that she should have. My saying "I love you" did not make up for the fact that she didn't feel loved when I yelled or raised my voice...and I never connected the two the way that I should have. Now it seems that it's too late. I can't get through to Adrianne to tell her how sorry I am and how much I miss her. She doesn't want to hear it. It's gotten to the point where she doesn't want to hear me say "I love you." I think that, in some ways, hearing that I love her makes her feel guilty or at least sad that I am feeling so hurt. I don't know though, because we're not really talking anymore. It's as if I'm an inconvenience to her and her happiness.

What do I do now?