It sounds like the rift was over a work issue, and you’ll do a lot better with him if you give him more time to cool down. Wait a week or two before reaching out. Right now, he’s probably still upset about the setback he suffered at work, and in a couple of weeks, he’ll start having some perspective on that problem, and be missing the part of you that is his friend. Don’t forget to apologize — send flowers and a heartfelt note.