It was 99% a movie (maybe a TV series but I don’t think so). It was a romantic comedy or drama. I don’t remember the plot exactly but there was a scene where the guy told his girlfriend that he loved her but she didn’t feel it back (she was literally unable of feeling love, there was some mental illness mention I think). After they split up because of that she went chasing after him and she explained to him that she doesn’t feel love like most people do as an emotion but as memmories of him (??). At first I thought it was ‘Love and other drugs’ but it doesn’t really fit.