Cognitive behavioural therapy (CBT) is used to treat gambling disorder (GD). However, we do not know if there are different recovery patterns after receiving CBT. This study followed 192 young male patients with GD while they attended a 16-week CBT program. It tracked their gambling behaviour and psychological state for six months after the CBT treatment ended. Participants fit into three distinct groups based on how they responded to the CBT. In two groups, participants responded well to CBT and their GD levels decreased and stayed low for the six months following CBT. In the third group, participants GD improved somewhat with CBT. However, this improvement did not last after the CBT sessions ended. Participants in this group had higher harm avoidance and lower self-directedness. This could make them more vulnerable to relapse.