Met my ex at movies, sitting next to me. Purposely ignored each other. Is it ego or hate?

He lost interest in me and we left the situation. Few months later I met him today at the movies. From my perspective 2 guys sat next to me and one guy made another guy choose another seat. That’s when I saw him. Our eyes met and I ignored. He asked his friend to leave the seat as it wasn’t theirs.
Now we both are left with one vacant seat btwn us. I ignored. Fast forward post interval his friend sat besides me again and he made his friend choose another seat leaving us sitting next to each other.

I didn’t look at him and I assume he didn’t look at me as well. But I did notice him always trying to come behind me be it on queue or after movie. Purposely staying behind.

And then he saw me again but ignored so did I. But it is kicking my anxiety.

Met my ex at movies, sitting next to me. Purposely ignored each other. Is it ego or hate?
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