How to mend a broken heart?

Me and my boyfriend broke up two days ago and though I used to say I'm not in love with him. It kind of hurts being without him and I miss him so much. And every one at work noticed how sad iam iam trying to overwork and go out with friends but even so I still think about him
I would appreciate any helping advice. I don't want to be sad.
How to mend a broken heart?
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