The first several things that came to Gladio's mind right then he had to push aside. He had to resist pointing out to Tony that they weren't 'together'. They weren't a couple. There was no need for him to treat him right or respectfully. They were just friends, right? Weird friends, but they were friends...

"Tony..." He started carefully, calmly. "... I've noticed how you treat your friends and you treat them well. And as for me. I'm the kinda guy who'd expect you to be considerate and respectful to Pepper and your kid over anyone else. You were with her so long..." Gladio sighed. "My only problem, the only one, is when talking about them hurts you. Or sets of an attack. If you ever want to tell me about them, Tony, I'm here to listen."