"I feel like next time I see H, I may be apologizing for my behavior. But I wanted to keep it short and sweet. Just saying that I'm sorry for the way I've been acting lately and leave it at that. "
NO. That is just more R talk. There is no R for you to work out right now. He is NOT IN THE R with you. Leave him alone. Stick to business.
If you regret your behavior, forgive yourself and behave differently.