Help find romance book series

Remembered book series from 2014-2017 that I can’t find. I don’t know names of characters or books, but I remember first one is about a guy and girl who get married after couple weeks being together, man is in military I think, disappeared for while and came back when she was in small town starting to date someone new. I believe part of plot was he was using her for intel. Another one of the books I believe the main girl is a hacker. At end of the books I believe they go to like a safe house in Montana or something like that. Please help.