Why would my guy friend who’s married just stop talking to me?

This guy and I have been friends for around 7 years now after meeting at university, I admitted I liked him early in our friendship but he didn’t feel the same (even though he acted as if he did) and we’ve been friends since.
We lost touch for a little while when he moved interstate and recently we reconnected online, he said he was happy to be friends again, talked every now and then for a few weeks but he took a while to admit to me he’s actually married.

I’ve respected that and we were talking every few weeks, just friendly etc and I would never come between his marriage- but now he ignored my last message…I was just making sure he was ok because he didn’t seem too happy. Why would he stop talking to me?
I understand he’s married etc but it’s hurtful.

Why would my guy friend who’s married just stop talking to me?
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