Why is my closest guy friend ignoring me lately?

I'm close friends if not best friends with this guy, we have been for almost a decade, but every now and then he becomes all weird with me and starts ignoring me.

just over a month ago I texted him asking if he was okay and he ignored it for nearly an entire month. When he finally rang he said it was because I said something to annoy him and that I didn't chase him enough? Anyway, yesterday morning we were mid conversation and his last message was "there needs to be more people like you in this world", i then replied and he just ignored it, is there any idea why?

i would text him and ask but i have a feeling he'll just ignore it, within all our years of friendship he has never ignored me, this is a recent thing and it's so confusing because I have no idea why he does it, do yous have any ideas?
Why is my closest guy friend ignoring me lately?
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