Final answer:
Topher expresses being disturbed and decides to stop what he's doing, he also apologizes to Sebastian for this decision.
Step-by-step explanation:
The statement made by Topher is: I can't do this anymore, I'm sorry. This phrase encapsulates both a sense of being overwhelmed or disturbed, indicated by the phrase 'Really creepy,' and a decision to stop whatever is causing that sentiment, as stated in 'I can't do this anymore.' Finally, Topher concludes with an apology, 'I'm sorry,' acknowledging the impact this decision may have on Sebastian. The question involves understanding the context and emotions conveyed in the dialogue, and defining the main statement Topher makes to Sebastian.