When do guys stop texting the girl?

Anonymous
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This guy is my friend and we both are currently in different countries. He started chatting with me on Instagram and sending me his cute selfies. I obviously didn't mind, complimented him and shared funny memes with each other. We would talk 3-4 times a week, sometimes even more and he initiated a lot.
This goes on for good 10 months. In between we didn't speak for 3 weeks because I got upset he took very long to respond. But then he always watched my Instagram stories and sometimes responded. We start chatting again and mild flirting.
Around May this year, I noticed his interest waned and he stopped watching my stories. I asked and he said that he was very stressed at work. Fine, I gave him space. Even initiated texts but he just replied to them. He stopped initiating like before.
It's been over 2 months now and he never initiated any text after mine. I don't know what happened or changed?
Did he get a new girl hence he is ignoring me or something else?
When do guys stop texting the girl?
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