Old Friend Insisting To Talk After 3 Years

I had this friend "A" whom I had known for sometime , I knew him since he was single and then got married I was friends with his wife too ,not close one but I used to talk to his wife ,more with guy
Now we had one common friend "B" , so friend A introduced me to friend B and we became friends then
B Was single and I was single too , we never dated , B had romantic interest and wanted to ask me out but my and his expectations were totally different so i never Said yes for going out with him and he understood. We remained good friends and used to talk often, he got other girlfriend meanwhile
Now this friend A out of nowhere started telling me not to talk to B because B is his family friend and he suspects B's mom is being insecure because of me , she is calling him every now and then. I asked A what did she say exactly, he said she didn't say anything about me but he is assuming he is calling him because he doesn't want her son (B) to talk to me. I initially avoided as A is only assuming, but then he started calling me and insisting me not to talk to B and start ignoring him ,I told him bluntly one day who I talk to is nobody's business And I'm not going to ignore B just because you are imagining
He got irritated with my answer and hung up the phone and blocked me on WhatsApp, FB and social media which I felt was super childish, I felt bad for sometime, I wasn't expecting to stop talking to him coz of this silly issue .
Anyhow since I was blocked everywhere I forgot about him and moved on with my life.

Now suddenly after 3 year I get his message on FB guess he unblocked to message and asked about life, I responded and asked about his wife too
I lost his number as well we exchanged number however I had no plans of calling him . And now from last 3 week I'm continuously getting his message can we talk. Can we talk. I told him I'm busy with some urgent stuff then he is asking me what are those stuff, this guy even in past would want to know did I open new business ,what is going on with new idea or what I'm upto ,he wanted to start some business with me and we used to discuss ideas . Anyways I'm not responding to him now ,but he is messaging everyday to talk, this guy disappeared after small argument and blocked me at every possible platform suddenly has urgency to talk after 3 years , I'm not calling or responding, he lost that friends place where I would call and invest my time in listening to him .
What is the reason now and what should I do?

 

Yes I shared number because I feel it's immature to not respond when old friend message you and I do have intention of talking to him but at my convenience not when he is messaging and bombarding me

 

Asking me to talk is fine but continuously messaging me everyday to talk to him is ticking me off and I changed my mind to speak to him

 

This guy called me at 7:30AM in morning , he expected to talk in morning, I disconnected his call and messaged him not to call early morning , it's time to drop kid to school and work, he felt offended and told me he won't call ever now
This is childish behavior, he went on telling me how he did favour to me in past and I shouldn't be forgetting that
I got pissed off this time and decided not to even call him back and start friendship again with such person
His actions show do what he wants else you are not friends anymore, in past
He blocked because I denied his demand to stop talking to common friend. This guy is nothing but a bully . I