How does that work, like what was there point or goal here?

So my friends with benefits of 8 years finally had the balls to walk away, and left me for someone else. So I get it, he used me, and I pretty much allowed it and let him. So I can only really be mad at myself. But my point is, why did he tell me Early on that he liked me, Why would he share certain personal information about himself and his family with me, Why didn't he keep it a hundred percent with me and tell the truth, Why would he tell me that he loved me, Why I get mad to each and every time I tried to walk away and he wouldn't let me, Why get upset, when I decided to date others and not him, Why did he get territory and jealous over me, Why share all these different emotions with me, if he isn't or doesn't feel the same, why tell that he cares, but then not show me, Why would he agree with me on being just friends. But yet, still wanted sex with me. Why fake to be my friend, Expecting me to give you some later. Then when I tell him NO, HE stops all Communications me out the blue. And lastly but not least, why tell me he's not going to leave me. But he did for someone. Why would he tell me all of this. I mean. $Like I get it he's an F boy and wants to be so-called player but seriously though. But Why would You tell me all these things. When he left in the end? :(
How does that work, like what was there point or goal here?
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