I only read a bit of the novel using machine translation so take this with a grain of salt.
I think it was just a misunderstanding. ML was confident in crossing since they haven't done the snusnu yet but MC hesitated because he wasn't sure what the standard of being considered a virgin/pure is (idk maybe he fingered himself or ML did or smth ). ML assumed it meant MC must've slept with someone before but MC was prob just genuinely confused.
ML didn't ask MC about it even though he was sad/jealous/angry because he didn't want to hurt the MC by making him recall the past my shayla Thankfully the situation ended on a good note

There is a part where the MC and ML must cross a bridge to obtain a box that contains an elixir capable of curing the MC’s resistance to healing. However, in order to cross the bridge, they must both be virgins.
The ML is able to cross because he is still a virgin, but the MC cannot, presumably because he is no longer a virgin. So, he uses GAIA (earth) to cross instead.
My question is, in the novel, does the MC tell the ML who he lost his virginity to?
Or is it because the ML penetrated him with his finger, and that counts as losing his virginity?
I’m really curious!