Why does he ignore me only around his girlfriend?

jokersgirl
My ex and I broke up in October. Since then we've gotten together a few times, but finally decided to only talk when we see each other out at parties. Recently, within a month or two, he got a new girlfriend. He deleted me from Facebook but not other social media stuff. Every time I see him around without his girlfriend he talks to me, gives me a hug and we chat for a few minutes, However, when he is with his girlfriend it is like I don't even exist. He ignores me and barely even looks in my direction. I thought we had ended things on good terms, so that's why I am a little bothered by it. Everyone I know says he still has feelings for me, But I'm curious what others think?
Why does he ignore me only around his girlfriend?
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