Research has shown that English language proficiency (ELP) plays a crucial role in the psychological well-being of international students (e.g. Li et al., "Journal of International Students, "4(4), 301-313, 2014). However, few studies have reported positive correlations between their improved English skills and well-being. The present study examines how a new pedagogy called personalised autonomous (PA) model can induce a virtuous cycle in international PhD students to enhance their English language proficiency and consequently, their well-being. We collected both quantitative and qualitative data from two groups of students: those who experienced the PA model in a course entitled Personalised English Language Enhancement (PELE) and those who did not. We conducted surveys at the beginning and end of the term to compare entry and exit data. Comparison of the entry and exit survey data for PELE students showed significant improvements across almost all dependent variables including self-efficacy, well-being and a sense of belonging to the university community. In contrast, the non-PELE students did not significantly improve in any variable. In focus groups, students indicated how their improved communicative confidence sparked a virtuous cycle leading to greater well-being and a stronger sense of community. Our data strongly suggests that ELP extends beyond mere linguistic ability; it embodies a dynamic interplay between one's language skills and their self-confidence. Diminished confidence may trigger a vicious cycle of fear of communication, unwillingness to engage, unproductive research, and estranged relationships with supervisors. Therefore, it is imperative for educators and policymakers to critically review and enhance their approaches to supporting the ELP of international PhD students.