Lyric discussion by coralfershoral 

this is definitely about a one-night stand or a relationship going too fast. most likely, the girl gets pregnant AKA "accidents will happen". "Though he says he'll wait forever / It's now or never / But she keeps him hanging on". He wants what he wants, and she's not sure, but when she gives it up, accidents happen. also, the relationship going to fast OR the one-night stand can have to do with the line "it's the words that we don't say" because with something as HUGE/important as that, there needs to be some 'i love yous' or some means of communication, and there isn't.

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