Why won't he just block me?

I have been chatting to a guy for around 9months, we have never met or anything and he calls etc. a few weeks ago he said he wanted a break (from the app we speak on) but didn't say why. that went on for 2 weeks. eventually he started talking to me again. he always said if we fight he would always get in touch with me, and he didn't block me because he cares then 4 days ago he started fighting with me again and won't tell me why. I have messaged him asking him and he just read my messages and won't reply. I'm attached to this guy.. he has been there from I got diagnosed 8 months ago. so it really difficult for me just to cut him out.
Why won't he just block me?
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