How can my ex walk right past me and act like I never existed?

jaspero1o2
How can my ex walk right past me and act like I never existed? Is it his way of dealing with the break up or what? When I'm with people and he walks by they say he is always staring at me until he gets past me, I just look past it though. I don't know what to say to him in the halls because I'm not sure if I should be the one to start the conversation, like usual. Why won't he ever start one? The day after he broke up with me he said he wanted to be friends but it doesn't seem that way now...Maybe it's too late. And what exactly does it mean when guys say they care about you just not as there girlfriend?
How can my ex walk right past me and act like I never existed?
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