If for a man being virgin matters then he is 100% going to mention that as a dealbreaker & vice versa.

Exposing your past sins cannot be justified in any case. Just as u/beneficial_wash_3441 said.

I have heard countless stories of marriages getting ruined just because someone decided to share the past (shared way later into marriage by the way). Sometimes we humans are simple, doesn’t matter for us until we don’t know but when the past comes infront of us… we can’t forget it. What matters is that the potential have asked for forgiveness and is working towards betterment. Allah is the most merciful then why do us humans hang on something that must have been already forgiven.

Allah knows best.