Had Jesus, with emphasis and no equivocation, not said that marriage was indissoluble, period, so clearly that his disciples wondered why anyone would want to marry that argument might work. And then, to make things even clearer, He said “If you love me, you will keep my commandments.”

That spears through the heart of “the spirit of the law rather than the letter. We need to judge the situation and context ...”.

Btw, lying is always sinful.