This reflective paper documents a personal experience of psychological strain, emotional destabilisation, and ethical disillusionment arising from a failed postdoctoral mentorship relationship within an academic laboratory. Written from the perspective of a senior academic who has long valued mentorship as a moral and scholarly duty, this reflective paper explores how sustained disrespect, boundary violations, and emotionally erratic behaviour by a supervisee can invert the assumed power dynamic of supervision. Through narrative reflection, this account examines emotional labour, insomnia, cognitive rumination, and the quiet erosion of trust that accompanies unprotected mentorship. This reflective paper does not seek retribution or adjudication. Instead, it aims to give language to a form of academic suffering that remains under-reported, namely the mentor who gives deeply and honestly from the heart, is destabilised emotionally, and is left unsupported.