Is a young man obligated to end his relationship with a girl he loves and promised to marry, despite the difficulty of fulfilling that due to differences in nationality, or should he sacrifice by living abroad for her sake?

Fulfilling the promise of marriage is desirable, and some jurists consider it obligatory. However, there is no sin in retracting it if new facts become clear. It is advisable to cut ties with the girl, guide her towards prayer and healing, and seek another wife.