A person's mental illness burdens their spouse or partner in multiple ways and significantly increases the risk that the couple will divorce. However, scant research exists about the impact of the illness on spouses' experience of self and relationship commitment. The author investigates how 16 Finnish, heterosexual spouses and partners of people with mental illness make meaning out of their self and commitment, including the role of religion in this meaning making. The data was gathered through narrative, semi-structured interviews and analysed with a narrative approach. For these spouses and partners, sacrifice was central to meaning making. They drew on religion in marital sanctification, justification and coping. The results show the importance of mental health care in supporting the spouses' separateness from the relationship or as an avenue of expressing their commitment. This finding highlights the need to invest in couple-centred approaches to mental health care.