While interactions with social robots are novel and exciting for manypeople, one concern is the extent to which people’s behavioural and emotional engagementmight be sustained across time, since during initial interactions with a robot, itsnovelty is especially salient. This challenge is particularly noteworthy whenconsidering interactions designed to support people’s well-being, with limited evidence(or empirical exploration) of social robots’ capacity to support people’s emotionalhealth over time. Accordingly, our aim here was to examine how long-term repeatedinteractions with a social robot affect people’s self-disclosure behaviour toward therobot, their perceptions of the robot, and how such sustained interactions influencefactors related to well-being. We conducted a mediated long-term online experiment withparticipants conversing with the social robot Pepper 10 times over 5 weeks. We foundthat people self-disclose increasingly more to a social robot over time, and report therobot to be more social and competent over time. Participants’ moods also improved aftertalking to the robot, and across sessions, they found the robot’s responses increasinglycomforting as well as reported feeling less lonely. Finally, our results emphasize thatwhen the discussion frame was supposedly more emotional (in this case, framing questionsin the context of the COVID-19 pandemic), participants reported feeling lonelier andmore stressed. These results set the stage for situating social robots as conversationalpartners and provide crucial evidence for their potential inclusion in interventionssupporting people’s emotional health through encouraging self-disclosure.