I don’t know how often you tried to reach out after the radio silence.

Maybe apologize for the meltdown and ask a question. If he gets back to you, great. If not, after a week say that you’ll give him all the time he needs and that you are here. Then, leave him alone!! Don’t be tempted! (Some people have been labeled “crazy” or “stalker” after communicating more than three times without a response!)

That is what I generally would do when getting silence.