Does this mean he considers us back together?

So my ex and I, we were talking about meeting up last night or so I thought, as the night went on i realized he wasn’t going to make it but he didn’t think to communicate that to me. Well we got into a big of a small argument, it got resolved thankfully but at one point he said that I could find someone else if I were going to get that mad. My thing is, wouldn’t we have to be together for me to find someone else? He kind of threw me off when he said that. What do you guys think?
Does this mean he considers us back together?
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