Give the FL a break, she's a normal sheltered high school girl and the world is a scary place especially for girls her age
and sure the reader knows that the ML isn't a bad person otherwise he wouldn't BE the ml in the first place (or this comic would've had a very different genre) but there's no way she would know that unless it's a 4th wall break or some supernatural isekai plot
Good work soldier now get your well deserved rest ε=ε=(ノ≧∇≦)ノ ♡♡♡