Most Helpful Guy
Just reach out to him with a phone call or text and tell him you were thinking about him and just wanted to talk and see how he is doing.
From there, face to face open honest communication is best. You have both cooled off, and if there is a chance of working things out, it is now. Just be honest with him calmly. Don't yell or lecture. Talk to him about how you are feeling, but don't overwhelm him or seem needy. Then listen to what he has to say.
Determine if the good of a relationship with him outweighs the bad.