By the way, didn’t Kristen break off with Michael before she got closer to Rob? Seems to me, Rob waited a year at least before she decided to make a final breakoff with Michael.
If Rob was annoyed by Kristen’s actions, it was for another reason, not what you say above.
I do believe that when these two are SURE and READY, they may marry. But, what’s the rush?? They are busy busy busy!!