Okay, so if you follow my tumblr then you know that I have been watching a lot of Doctor Who lately. It is an awesome show and one thing that I have grown to love is the pairing 9th/10th Doctor/Rose.
|Source (I think... You never know with the internet. But yeah, thanks to whoever made this!)|
Then stuff happens and Rose is trapped where the Doctor can't come get her. They have to say goodbye for good. It's a beautiful story:
|Source (Mostly likely. Like I said, you never know. Once again, thanks whoever made this!)|
That said, this tactic can backfire if you don't use it right. The writers of DW give the Doctor plenty of time to grieve Rose after she's gone. He doesn't find someone else right away--as far as I know, he doesn't find anyone else romantically for a season and a half or something like that. (River, right? I'm only on season/series 3.) They show the Doctor grieving Rose: Wondering what she would think about things if she was there, imagining/remembering himself dancing with her when a crowd of people are dancing, finding some of her stuff on board the TARDIS. (aka his space ship, for those not in the know.) He doesn't move on right away, and if you're going to do the sad route, you have to make sure you get the pacing right, or it makes the whole storyline for nothing. If the Doctor had a new love two episodes later, it would have cheapened his and Rose's love story, in my opinion.
Oh, and if you're going to bring in a new love interest afterward, make sure they have personality. I don't want to spend the whole new romance thinking, using the Doctor as an example, "I hate this new person, bring back Rose." That is the last thing you want your readers thinking, so please make sure the new person is as enjoyable and has as much chemistry as the old couple. Just make sure that they are different from the old couple. I don't know about everyone else, but I don't want a repeat of what I just saw, but with a new face.
Anyway, that's all, hope you found this helpful. :)