I sent him a short message and said a few words of concern, but he didn't reply. Does this mean refusal?

I think you should treat him like others in the future.

Don't deliberately alienate

Be sure to live a sunny life.

Let him know that you don't have to be with him. You must be ambitious and support you.

A man worth fighting for is not worth fighting for.

Live a good life, being alone is also wonderful, and you will find your happiness!