Why does he get defensive if I ask about his female friends?

Billie_
For example, I asked him today what the relationship he had with this one girl flirting under his photo. I know he has female friends, and it was before we were dating but I was just wondering if he flirts with her still. I wasn't passive aggressive, just asked what their friendship was like.

He tells me they used to date and then just be friends. So Im kind of okay with it but taken aback and ask if he still flirts with her. He tells me he doesn't and then gets angry at me for asking. He said "Do I need to tell you about every girl I used to date now?"

I'm just kind of confused. Im not mad at him, and I trust him. He knows I'm not jealous. But is his response kind of a red flag? I don't get why he was so defensive about it if he was secure in their friendship?

Thoughts...
Why does he get defensive if I ask about his female friends?
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