yes, confuddled - exactly.
My ex and I were nothing more than people living in the same house for over a year before I left.
DH was my catalyst, but only because I had no money or income and no way of moving out on my own.
In fact, for the first month after I'd moved in with DH, we had separate rooms, and dated properly, as if we were house mates who went out with each other.
(and we didn't have sex until around the same time I moved into his room)
The thing that annoys me most, though, is that it was Ex that finished our relationship, but he blamed me for leaving him! 
So, all that time that we were in separate rooms in the same house, and he effectively didn't even talk to me for months, that was him believing we were still a couple!
About a week before he found out about DH, he even tried to argue with me about the fact that he'd "not gotten laid in over a year!" - that year was the year that he said we were over and that I'd put the nail in the coffin of our relationship (by opening my shop)