He thinks I’m pushing him away?

I’ve been dating a guy for about two weeks now and it’s going well. Yesterday I bumped into my ex, we’ll me and my ex have the same friends so I saw him through my friends. It really hurt me because he was going to another girls house. This put me in a bad mood and I had plans with the guy I’m seeing. Me my friends and the guy I’m seeings friends were all together but I admit I was acting off, I was being pretty cold because I was just in a sad mood. He got really angry and upset with me and was messaging me saying you were just ignoring me being so cold, you didn’t even say hi. I told him I’m really sorry I just wasn’t myself, how can I make this up to him? I feel so bad. He seems to have calmed down now since last night but I don’t know what I can do to make him feel better.
He thinks I’m pushing him away?
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