Why does my ex ask every other girl to give him a second chance but never messaged me again?

Anonymous
So my ex and I were best friends before we started dating. I migrated to another country and for the first three months things were great, time went by and like tiny issues started arising. A friend of mine told me that my ex is dating someone else but I was hesitant to believe him because I wasn't on good terms with that friend of mine. But I did confront him and the girl and they said that they were good friends. I let it go then but my ex started accusing me of dating someone else when I was all about him. Skip to the next month, I went back to my country for vacation, we met and hung out, so at that time I had his Instagram and messenger password and i was the only girl he messaged on it, but I didn't have his snap, I was using his phone and I went on his snap and he just snatched his phone from my hand. That made me really curious.. I got his snapchat and the same night I saw the messages between him and the girl that my friend warned me about. They were dating but she didn't know he was with me until I confronted them. I broke up with him but after a while we got back together. I came to the states again and things became so ugly, he would accuse me of cheating. That's when I reached out to all our mutual friends to find out what was going on over there and they told me that he was with 6 other girls... I messaged my ex who was a good friend of his and he told me everything. We broke up, and he kept coming back to get back with me but when I refused, he turned the tables on me and said that why did I ask my ex for help and all and even though I told him that he's the one that's cheating he would still blame me.. after two months he again messaged me to get back but this time he told me he was 3 other girls. So I refused but he said that if I get back he'll leave them, but then I disagreed and he brought the whole promises and how I broke it. After three months he messaged me again but didn't hint towards us getting back. And that was the last time we talked.
Why does my ex ask every other girl to give him a second chance but never messaged me again?
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