Why did he block after 9 days of no contact?

my ex boyfriend that I dated for 4 years and I broke up 9 days ago. He would always try to break up for any argument he didn’t like happened couple times and I would beg and he would be like ok we can work it out but basically I always reached out and tried for us. This time around no way, I was at my wits end. He wanted to break up after a fight and I begged a bit and then said alright fuck it go. I stopped calling , texting and pleading and went ghost WHICH I HAVE NEVER DONE BEFORE. I noticed today through another IG account that I have (which he knows) he got back on to instagram after being off of it for a year and got on and blocked my other account. Found it like hm ok I haven’t bothered you and I left you alone what’s the deal? Thoughts? I don't know if he blocked my number because I’m not reaching out to find out

Updates
4 mo
The account he blocked was a business account for my dad wasn’t even anything I post on so he wouldn’t see any of my personal life. He just knew I would look on his account through it in the past
Why did he block after 9 days of no contact?
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