Hello all,

Am trying to figure out the title of a drama or rom-com I watched years ago on a plane (2010s I think). It involved a guy who got invited to his ex-girlfriend's wedding and then the movie rewinds to show how they met. The movie started off in high school where she was (I think) tutoring him and he would get some sexual teasing at the end. Or maybe he was tutoring her and she repaid with the teasing. At some point, she tells him that if she's gonna get married, she's going to make sure there's a surprise in it. The next thing I remember is that he was doing his military service when it turns out that she was also in the same unit? I cannot remember beyond that. Any help would be appreciated.

Thanks in advance!