You don't have to worry about girls trying to scam MC, or it really being anything nefarious towards MC. Based on what we've seen so far, the secrets from girls side exist because they are worried that MC might disapprove them because of their actions and they are worried about losing MC. So far none of the girls have done actually anything that i'd count as betrayal of trust really, nor are they going to go against MC. And
SpeedPostx themself has said that there's no worry about netorare in this game, so that should also put your mind on ease about it, since Speed so far has proven to be honest enough, that there should not be any fear of bait and switch. I would think majority of devs now know that it will only lead to failure.