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Do you want him back? In that case you must not reach him in any way. Let him come to you otherwise, he'll back away from you even more.
This is called the no contact rule. I adapted it to my case, and made it the don't initiate contact? meaning that, I never contact him and only reply short, non emotional messages. I replied only to 1 out of 3 of his messages or calls.
If you chase him, you will lose him definitely.
He probably still has feelings but also doubts so give him the time to figure things out. And you live your life in the meantime. Men want sweet women, but not needy desparate women: show him you're doing great without him and you'll once again gain his interest.1