We’ve been dating for a couple of months but have been friends for longer.
Yesterday, after a nice day together, we went back to his place. Out of nowhere, he asked what I'd do if one of our mutual friends, Alex, showed romantic interest in me. I found the question odd since Alex and I are closer than they are, and it felt like it might stem from insecurity. He continued to press the topic.
I told him my friendship with Alex is purely platonic, then asked why he'd even bring this up, as it felt immature. To make a point, I stated it would be the same as if I flipped the question and started pressing him how he'd feel if another mutual friend, Mia, expressed interest in him.
He immediately replied, 'Well, if we weren’t dating, I’d definitely give things a go with Mia; she’s a really attractive woman.’
Am I being unreasonable to be put off by this? Not just by his immature question about my friend but also by him openly stating he'd date another friend if he had the chance.