The security guard took the initiative to say hello to each other, deadpan.

A person's indifference to you means that a person faces you without any expression, which means that the current state is also very clear, clear and sober. Maybe this person's relationship with you is not very close, and it may still be a strange relationship with you, not very familiar.

So he may not have any feelings for you for the time being, but when he faces you, it is a state of no expression.