What do I reply to his message?

We met online about two months ago. It was very intense in the beginning to the point we confessed we liked each other. Recently he ghosted me about a month ago. He replies about every 10 days to my message and today he replied and said, "Miss you too but it’s kinda hard stay in contact like this for me. Hope you’re doing good these days"

What do I reply to this? Did he lose interest because thats how it looks and feels to me.

What do I reply to his message?
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