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...