Given the below context:  Nina, an interpreter, is beside herself with grief at the recent death of her boyfriend, Jamie, a cellist. When she is on the verge of despair, Jamie reappears as a "ghost" and the couple are reunited. Nina is ecstatic. But Jamie tells her about his days while she is at work, and one dialogue suggests she should embrace the life around her; one of these is about a memorial plaque in a park about a dead child and how parents who read it feel an immediate, compelling need to hug their children. The returned Jamie also reminds her that he also irritated her, and as a ghost he manifests behaviours she'd have little patience for – turning up the central heating to stifling levels, moving furniture around and inviting back "ghost friends" to watch videos. This infuriates her, and their relationship deteriorates. She meets Mark, a psychologist, to whom she is attracted, but she is unwilling to become involved with him because of Jamie's continued presence. Nina continues to love Jamie but is conflicted by his self-centred behaviour and ultimately wonders out loud, "Was it always like this?" Over Nina's objections, Jamie decides to leave to allow her to move on. Towards the end of the film, Jamie watches Nina leave and one of his fellow ghosts asks, "Well?" and Jamie responds, "I think so... Yes." At this point the central conceit of the movie has become clear: Jamie came back specifically to help Nina get over him by tarnishing her idealised memory of him.  Guess a valid title for it!
Truly, Madly, Deeply