I kept yelling at my screen, "it's a game show where one contestant gets a shot at dating the lead!" The whole engagement part with the ring, down on one knee etc is just for TV ratings drama and largely meaningless.
I would not be surprised if Luke wasn't that familiar with the format and bought into the fairy tale bs. Not an excuse but an explanation for some of his behavior.
That being said, I think Luke is a really controlling guy who has the potential to be abusive (emotional if not physical) and in the climate we are currently in, it's necessary to call that behavior out. A lot of the male contestants did do that (no means no) and it was nice to see. In the larger scheme of things, when I think about say teenage girls watching this show, it's been a good season with it a lot of important issues being brought up.
I would like to see older contestants. Imagine if everyone was in their 30's how differently these relationships would play out.