u/heymarklook

I am new to the ENM space and need opinions. I have been on a few dates with someone who mentioned they have a connection with someone else. I tried asking questions about what their relationship is and whether it’s someone he is romantically vs. sexually involved with. He didn’t feel like he needed to define that connection and danced around the question of if he’s polyamorous or not. I feel like he’s hiding the depth of this connection and trying to have it all. Is this a red flag?