Unblock faceboook

I was just in love with this guy for years. He cycled through being nice and downright hurtful and vindictive but never gave me the relationship I wanted. Intstead he would throw me breadcrumbs and got me to the point of almost being his personal slut just to stay in his life. It was pathetic.
Then I started to distance myself. In response, in February he blocked me on his phone. He unblocked me a couple weeks later to ask me to meet up. When I asked him about it he said he did it because his daughter had his phone, and he didn’t want texts from me coming through. I told him I never send him inappropriate texts and asked him not to do it again. Well, he did. I figured He was trying to make me feel uneasy and compete for his attention again. In April when we last got together I thought it seemed to go really well. We got along great, and when I explained how much the blocking bothered me he seemed to really listen. Well, the next day I was blocked again. I was devastated.
In June he reactivated his Facebook long enough for me to see his public relationship status. As you all know how that feels, I was beyond crushed. I messaged him on Faceboook asking him to please unblock me. He responded by blocking me on Facebook, too, I assume So his girlfriend wouldn’t see. I resorted to texting him from my friend’s phone about how he would never understand how much he hurt me with his behavior. He started calling my phone from a blocked number. I repeatedly Ignored it and then answered nearly in tears. I asked him what he wanted, and he mentioned that he has a girlfriend but would be willing to still have sex with me if I didn’t tell anyone. I hung up on him. He called back asking what I want; I said all I wanted was for him to stop treating me like trash. He insisted he didn’t and again mentioned hooking up. When I told Him no he hung up on me. A few days later I texted him again from a friend’s phone, asking him to unblock me, and he didn’t. I was truly depressed for so long about it.
Then a couple weeks ago I got a cryptic text from a number I didn’t know. I knew he was in town for the week (he goes away for work) and figured it was him. When I didn’t Respond he sent a sexual one. I asked if it was him, and by the response it clearly was. I told Him I had no interest in sleeping with him but would like to talk. I said how much his behavior has hurt me, and I just wanted to talk about it. He said never mind and quit talking. I saved the number to my contacts, logged in to snap chat to see if there was an account tied to, and lo and behold there was. To a guy I didn’t Know. So, he was texting me these things from a friend’s phone. I was Angry and embarrassed and texted his cell phone, only to discover I was still blocked.
I made huge progress in that I didn’t jump for the chance to get back in his life. As much as I hated the mistreatment, I would still did anything possible to keep his attention. But it hurt to see that not only would he refuse to talk to me, but that I’m still blocked. I just don’t understand why he would keep me on block all this time and use somebody else’s phone to text me.