Christ told the rich young ruler to do so.
He did not chase after Him.
We do not see Christ chasing the unbelieving Pharisees either.
And neither did He clarify His remarks at Capernaum, after speaking about His Body and Blood.
He had already made Himself perfectly clear, and the disciples leaving Him had understood His words correctly. They left because they couldn't accept His words, not because they misunderstood them.
So, yes, we don't see Christ chasing after any of these people. He had spoken, and they had reacted. There was nothing to clarify or restate.
Those disciples knew what Jesus was offering them, and they couldn't accept His words. Just as today many readers of this thread cannot accept them.
You're not alone in this. May God give us all a deeper understanding of the Eucharist.