My ex has cut me out of this life!

My ex boyfriend and I didn't have a bad break up. I've bumped into him twice in the last few days-walked right passed me and I could've been air! Why do some men feel the need to completely cut you out as if you never were anything and are nothing now? I just want us to be able to wave and smile and move along! He's acting like I dumped HIM, which is not the case!
My ex has cut me out of this life!
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