No, Courtney and Duncan are not still together. Their relationship, a prominent and often turbulent one within the Total Drama series, ultimately ended due to irreconcilable differences.
A Turbulent History
The dynamic between Courtney and Duncan was a significant storyline throughout their appearances on Total Drama. After periods of conflict, the two characters did eventually reconcile, notably making up in the episode "Top Dog." However, their reunion was short-lived and came with significant stipulations that ultimately led to its demise.
The Final Split
Despite their attempts to rekindle their romance, Courtney introduced a set of overbearing rules for their relationship. These rules were so extensive and demanding that she expected Duncan to completely memorize and rigorously follow them if they were to have any chance of a serious future together.
This imposition proved to be the breaking point for Duncan. Faced with such stringent and high-pressure expectations, he found the relationship unsustainable under those conditions. As a direct consequence of this tension and the burden of Courtney's rules, Duncan voted Courtney off, signaling the definitive end of their romantic involvement. Their relationship did not recover from this event, marking the end of their on-screen romance in the series.
