That's how I felt with my ex. All the b/f's I had before him didn't want guys to look at what was theirs - but not Jack. Nope. He trusted me and didn't get jealous. It pissed me off!!! It felt like he wouldn't care if he lost me.
Girl, guys like these are enigmas. We'll never know why they do these things, unless they were taught to share through-out their life.