I can't stop thinking of my ex?

It's tearing my heart. He's moved on and has a new girl. I'm still living in our memories and I don't feel I'll ever move on. I still think of our first date and every single moment that made me happy.
I still remember his voice and how he hugged me.
I feel the whole break up was and still is my fault, even though he was flawed, and many of my friends say he's no good for me and it's his fault.
I just don't see my life without him and it scares me because I know we'll never be together and I need to move on.

... just how does one move on?
I can't stop thinking of my ex?
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