This is a topic of very wide debate, almost borderline more suitable for the Watercooler forum here. However there have been three occasions where the Doctor has had unambiguous romantic leanings towards his companion:
- Rose Tyler, per "Doomsday" and "Journey's End".
- River Song, per multiple episodes including "The Wedding of River Song", "The Name of the Doctor" and "The Husbands of River Song", plus the fact that he marries her in his Eleventh incarnation.
- Clara Oswald, per "Deep Breath" in which the Doctor confesses that he thought of himself as her boyfriend. After the death of Danny Pink, the relationship between the Doctor and Clara deepened, climaxing with the Doctor sacrificing 4.5 billion years to save her life, however there is difference of interpretation as to whether this was out of simple friendship, romantic love, platonic love, or a combination of all three, with the scripts for "Heaven Sent" and "Hell Bent" pivoting between different points of view. But "Deep Breath" confirmed that such feelings did at one point exist. If one is willing to take into account comments made behind the scenes, series producer Steven Moffat has stated multiple times that the Doctor was in love with Clara, even into his Twelfth incarnation, but chose to use euphemisms such as "Do you think I care so little for you that betraying me would make a difference" (from "Dark Water") instead of more straightforward "I love you." In interviews with media and public Q&A sessions in the fall of 2015, both Peter Capaldi and Jenna Coleman indicated that, in their opinion, the relationship between Clara and the Doctor was romantic in an "old-fashioned" sense.