I honestly don't see why any of this is even an issue.
He doesn't want you (right now) but doesn't want anybody else to have you (or even just your attention) either?
Sounds like a pretty shytti deal to me. He doesn't sound like a very good friend, a good friend would want you to be happy, even if it ends up stinging him.
He has no right to be offended, that's his problem, don't take it on as your own.