Why is he ignoring me?

Me and my guy best friend have been friends for six years but for some reason about a month or two ago he started to ignore me for no reason at all I never kissed him said anything offense nothing like that he texted me and I texted him and he blocked me and then every two to three days he will unblock me so I'll text him again he'll block me and so on. So my question is if i do something like a grand jester will he stop ignoring me do I ignore him like I'm just really confused I have been trying to get him to talk to me but he won't and I don't know what I did does he think I'm clingy I need answers help pls and thanks

Why is he ignoring me?
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