I'm stuck in a routine. what can I do to not think about work, a break up and how my life is going nowhere?

I broke up with my girlfriend six months ago and she went to live in another country. she's doing great and I'm still where I was when she left. Same job, same routine and the heartache of a break up. what can I do to not think about this type of stuff and make my life less miserable right now.???