Because
A)Toby was mad at her for making Jenna blind.
B)Alison threatened to tell Toby's secret (having sexual affairs with Jenna) to everyone.
C) Alison was wearing Toby's sweater when she was last caught before she went missing.
D) Alison was recorded with a "mystery man" (who turned out to be Ian) trying to convince him to kiss her also while wearing Toby's sweater. They try to convince us that the mystery man was Toby.
E) Toby is just a generally creepy person who Alison thought stalked the girls.
Toby
Toby's real name is Keegan Allen
Yes he does! :)
nop
Up the road from Emily's House
in the bahamasGONE CAUSE there not in pretty little liars
Alison.
Yes.
Toby
Toby
Where is Toby's house? The truth on pretty little liars
Keegan Allen
yes!
Toby Cavanaugh
Mona and Toby
Mona. Then Toby
Sadly he is :(