Is he hiding something or is it just me?

I sleep with this guy and be at his place a lot. We aren’t dating and he likes to remind me of it all the time. The only fishy part is how he says it. He told me a few times he’s been sleeping with another girl or he’s seeing another girl and I get mad. He lets me know I can’t get mad because we aren’t together and that I’m single. He never says that “he’s single” and we aren’t together but that I’m single.

Is he hiding something or is it just me?
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