Such things will only happen if they have been cheated on by their boyfriend or girlfriend.
No one can be broken just by training alone unless they are going through other domestic issues. Some guys or girls have a predisposition to cheat on their girlfriend or boyfriend when the former is hard at work as a trainee.
It’s such irresponsible, insolent and unforgivable behavior that reeks of audacity and condemnation. The girl or guy who breaks up with their other half when that other half is busy training just for 6 months deserve to remain unmarried for all eternity.