When you immediately realize your thot radar was broken initially because she was unconscious YET after 'lunch' you realize you didn't reset it since you first met.
Now it's just blaring at you 'Thot ALERT!'.
When you haven't discussed anything, no intimacy at all, definitely no sex. Yet she calls you her boyfriend in front of her stalkerish senior.
Worse still gullible idiotic fool the MC is, don't forget amnesiac, thinks she's being great and doesn't realize her hidden intentions.