My exes friend messaged me after a party. Should I tell my ex?

Anonymous

My ex and I have been speaking for awhile and recently for new years, he invited me to his friends house party. It was fun and I met a lot of people, one of them being a friend of his. He was really nice and the day after the party messaged me on instagram to say hi and asked how I was doing. We spoke at the party about how his brother worked at a place where i’m able to get a camera and on instagram we spoke about which cameras he recommended and stuff. He sent me the photos he took of everyone, and my ex knew about that, but I already mentioned that to him. I feel like the conversation is going to keep going and tbh it feels weird to even have a regular conversation (no flirting or anything) with him without my ex knowing and I feel like he’s going to be upset. Should I tell him? What should I say?

My exes friend messaged me after a party. Should I tell my ex?
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