Why did my ex run away when he saw me from behind? (explanation/thoughts)?

Anonymous
So it has been 6 months. We broke up, I told him it was best to part ways since i suspected him of cheating (texting with a girl). He denied it but 1 month after he was hanging out with her every weekend until Feb. When he went on a date with her, made out, and something happened that caused a rift. He would constantly freak out over what i posted on insta (bikini pic, and pic with guy friend). After pic with guy friend, he decided to get into a relationship after saying a day before he wasn't ready for one. Well my friend is in his group of friends (only girl there). And she says their relationship is weird. This girl has had a thing for him for over 3 years and now he's dating her. Well its funny because she lied about me harassing her etc. And apparently this one gave him sex whereas i did (we were together for nearly 1 yr and with her 1 month and a few weeks) AND my friend and his graduation were this week. Last week he asked her if i was going etc. Well i went to her graduation looking really good (hot). Got so many remarks and guys staring at me. Even girls. Well my friend said he was coming towards us or near us, my back was to him ( I didn't see this happen) but once he spotted my back. He left walking like the wind and left his girlfriend behind standing alone. She didn't even know where he had gone LOL Why? And his best friend saw me and hugged me. Said "it's been a long time" (this friend would ask about me to my friend and told her i wouldn't find another guy like my ex) HAHAHHA soo?
Updates
+1 y
Long story short: why did he run away when he saw me from behind leaving his new girlfriend stranded?
Why did my ex run away when he saw me from behind? (explanation/thoughts)?
3 Opinion