I am on Season 4 Episode 7. Somewhere along the lines, I got the impression that they got married.
I binge watched this entire thing from Season 1, all 22 grueling episodes and then Season 2, same thing, I went through Season 3. Paused and watched the movie before I started on Season 4.
He got on a knee and proposed. Now, he's in some other country on assignment while she's having wet dreams about Leo and I have this episode and one more before I'm done with this binge watch. When did they get married?