The realization made Hebel even more fearful of Rina than he already was. It meant that Rina likely had even more evidence against him than what she had already shown, and based on his actions, cuckoldry might be the least of his problems if his assumption was true.
'I shouldn't attempt to go against her unless I am confident that I can escape unharmed,' Hebel realized. However, to him this seemed like an impossible task since Rina could have a backup plan in which, if he failed to stop its release, it would send all of the information to anyone she deemed powerful enough to use it against him as leverage or even the family head for worse.
Hebel's assumption was correct, but he was wrong about where the backup data was stored.