Guy who I blocked has messaged me off his job account, why?

I (27f) have been seeing this guy (28m) on and off for a couple of months and I said I don’t want to be involved with him anymore as he confessed to dating someone else and he had no respect for me.

I blocked him off all the accounts I know he has and his phone number. He has since messaged me on his work account and said “I’ve tried messaging you on Facebook and you’ve blocked my accounts?”.

The last message I sent was “I don’t want to be involved with his anymore”, which was left on delivered for days.

Why now has he messaged me? Surely I’ve been pretty clear?

Guy who I blocked has messaged me off his job account, why?
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