it’s letoeles. It’s an aveira if you don’t say it…However if you don’t know if it’s a hundred percent true, don’t say it.
sometimes in shidduchim people go up and beyond “letoeles” just to ruin a shidduch, either for alterier motives, or for the sake of it… Look out for yourself and try to find out in other ways if it’s really true.. You might be pushing away your own zivug…