hey i just went through old replies and now after having played the routes quite some times i see it tbh:
-while you eat dinner with lake he send a text to someone, maybe torulf
-if you ask torulf to stay in his room he says he need to "cancel something" without giving much more detail
-and yeah also the thing about lake going sneaking out of the room during the night
Being a visual novel those details probably have some meaning, maybe we're thinking too much on it but it's definitely suspicious