Why does he initiate convo and not continue?

We recently had a falling out and I gave him some space. We have been chatting 2-3 times a week or so, when I initiate convo he seems fine to text, but it is alittle dry (before the fall out he would constantly talk).

Now when he sends me articles or photos to initiate convo he cuts off the convo so short. I do give something to work from but he ends it straight after.

I dont get why he does this?
Why does he initiate convo and not continue?
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