I don't see Luke following the old rules of the Jedi regarding love and attachments. First, I just don't see it in his personality. He wasn't "raised" in the Jedi Order, he was raised in the "real world", therefore he's gonna have more "real world" sensibilities and perspectives when it comes to stuff like that. I also think it's much harder to give up something you've already allowed yourself to dream and yearn for--if that makes sense. Second, he *really* wants Leia to train in the ways of the Force. That's obvious from their conversation on the bridge in ROTJ. It also seems obvious to me that Leia is a bit reluctant to do this. So if Luke were to then throw in "I want you to become a Jedi, and btw you have to end things with Han" I'm pretty sure that would be a deal breaker for her. So I doubt he'd push that issue. It's not in either of their best interests. And finally, he's trying to rebuild the Jedi Order, right? How much harder do you think it will make the "recruitment" of young Jedi if they were told they had to live a life of celibacy on top of that? Again, it would be way easier to let those rules go. But really, at the end of the day, I just think Luke would be way more progressive about all this stuff. At least, I'd like to think so.