How do I move on?

My boyfriend and I (ex boyfriend now) we were together for almost 3 years.. yes it hurts that he left me it's been a few days and all I do is cry and I can't sleep and I don't eat I lost my appetite.. I'm not so happy... either... what can I do to try and get this off my mind? And what can I do to try and move on? Hangout with my friends? I know it's gonna take awhile to move on but I'm in so much pain from just losing him.. but we're still friends..
do I need to go on "dates" that's what someone said to me but I don't wanna.. but will that help?
How do I move on?
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