Oh Carm, my son just turned 2 and I couldn't imagine having to extract him from me and his dad's bed 10 years from now!!! My jaw is literally to the floor. He likes having his own space so I'm glad about that. I'm happy you're putting your foot down. You don't wanna be struggling to get him into his own space by the time he's entering high school and all that.
Ignore Sun's half-assed whispered apologies. They're useful to no one but maybe his conscience.
You sound like a really open, honest parent. That's awesome.