Why he keeps blocking me then unblocking me?

Neero
Hi
I just wana know why would a guy keep on continuously blocking and then unblocking me on whatsapp? Is he confused or is he doing it on purpose to catch my attention or simply angry?

Basically me and this guy we were in love for 5 years ( or maybe we were) i admit i still have feelings for him... but I want to know if its worth it to talk to again or not?
We used to have a long distance r-ship but then he broke up with me. We stayed friends for 2 years. Then I moved to his city to study and he shockingly started to show feelings for me after meeting him ONCE. He tried to help me settle down and guided me around.
However the problems started, he began to ignore my messages on whatsapp. I asked him for help with a problem I was facing and he didn't help me at all and turned his back on me. He later apologized but i didn't c any positive change.
Later on he breaks to me that he is committed to a girl and wants me to stop contacting him. I broke down and cried and my sis talked to him and he met me&my sis bla bla, we ended it and i stopped contacting him.
After 3 months I stupidly said hi and asked him about a guy for a reason (gym thing) then he BROKE in anger saying why r u talking to too many men, y u seem so interested in him, y u acting like a bad girl, your too forward, dont talk to strange guys bla bla... I was shocked cuz seemed to me that he was jealous yet he said awful things about me.
After that he blocked me. Few months later he contacts me saying how sorry he is and that he wants to see how im doing and wants to meet me... he unblocked me.
I refused to see him and I told him to NEVER contact me again. Cuz its not first time he disrespects me, i couldn't believe him again. After some time he comments on my status which I wrote on whatsapp saying 'i am stressed' and he asking me y r u stressed? like as if he cares. I DID NOT REPLY.
Since then he's unblocking me and blocking me, IS HE WORTH TALKIN TO? I dnt even think he has a girl.
Why he keeps blocking me then unblocking me?
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