Only of the 5 five films where...

...the main "couple" Nick/Lori is actually a couple throughout the movie. In the first 3 movies, the main duo (Alex/Clear in 1, Kim/Burke in 2, Wendy/Kevin in 3) are basically just semi-reluctant allies throughout and don't get together (if at all) until the end. Actually, in 2, it's vague if if Kim/Burke are an actual couple at the end, and in 3, Wendy/Kevin definitely are not a couple at the end. And even in 5, Sam/Molly are estranged and apart throughout most of the movie.