Why does he pretend that he doesn't know me?

Anonymous
it's been 6 months since we broke up. we were in love when we were dating and when we broke up. He broke up with me now he has a new girlfriend. Today was my first day at a new school, where my ex goes. we hang out with the same people, but he would not say hi, even though I was standing right beside him. he pretended like I wasn't even there, and would walk away a couple seconds after I got to the group of people. I thought we were on good terms because we met up in december.. but I guess not? his girlfriend is never there when we are together in the group... so I don't get why he has to be rude and not even say hi.
Why does he pretend that he doesn't know me?
6 Opinion