He is friends with all his exes, except me. Why?

We were friends/best friends for 10+ years. Then we were each other's first everythings and dated in high school/college for 1.5 years and broke up because he wanted something better. A year later, he came back to me after his girlfriend cheated on him. We dated for 6 months, sunshine and daisies. Then left me for someone else. This new girlfriend saw me as a threat? and cyber harassed me for the length of their relationship, which ended with her cheating on him. Fast forward to this summer: We attend the same martial arts practice and see each other basically every week now that we're both home for summer. And every week he ignores me, he doesn't initiate conversation, and when we do talk it skims on superficial and stilted. Which brings me to last night: One of his exes showed up at practice, the one that harassed me relentlessly. He had no problem initiating conversation with her, talking and laughing, while simultaneously ignoring me like always. Why? In both instances of our relationship, I was left behind for something or someone better. I treated him with respect, adoration, and as an equal partner in life. I loved him to my core and for a second I know he loved me too.
He is friends with all his exes, except me. Why?
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