Kyrie Irving said, “no” and “why would I have to?” when asked if he told LeBron before he went to the front office and put the trade request in. That question is why Kyrie wants to leave in the first place. Kyrie is 25 years old and trying to put himself in a situation where he can develop his abilities as the focal point.
He doesn’t owe it to LeBron to stay and play with him or tell him when he wants to leave. The decision is his and that’s why he wants to leave.