How to be friend with a guy I rejected?

I rejected him but he is nice and we were friends before. I mean i liked him onve too. Wa have a lot of mutual friends so we meet even if we wouldn't want to and i dont want this awkwardness between us when we are around. Does it take time to get to friend relationship again, i guess we kinda have to learn to be friends again right? What do you think?

How to be friend with a guy I rejected?
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