Shiduchim

When it comes to a shidduch and a person knows that they have an issue in their past or something current which may be important to reveal, they should discuss their particular situation with a rov because there is the possibility of transgressing the very serious issur of oinaa and gneivas daas, deceiving people and cheating them into something. Something that ordinary people would consider a mum, something very inappropriate, even if it happened in the past, must be said. Discussion with a rov is important to decide at what stage to disclose and how to go about it. Likewise, if a person knows information about another individual who is interested in engaging in a shidduch, they should discuss with a rov at what stage to disclose it and how to say it in the appropriate fashion.

https://halacha2go.com?number=93

Practical Halacha: One minute a day. By Horav Yosef Yeshaya Braun, shlita, Mara D'asra and member of the Badatz of Crown Heights.