Our expert says:
As Anon says, one should only help without expecting anything in return, not even repayment, but this would, inevtiably, be an annoying and frustrating experience. And if he promised to repay you, he should to do so. But with strangers, you cannot predict the outcome, and its wisest to give only if you can afford to lose it. Its not clear from your message what the time-scale is here, Even if he has been delayed by further car trouble, he could presumably still have contacted you to explain
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