Re: calling off
it is a difficult situation i agree, but if either guy or girl has doubt they should take action fast - as it will be even worse in long term if it came to a divorce, dont let things get that far - sort it out amicably by talking to elders, if not parents, maybe chat to an aunt/uncle or close friend who can get the message across.
Otherwise this person will regret they didnt speak up when they had d chance...theres many ppl who are suffering in silence...