This whole album is mostly about a relationship gone horribly wrong when it says "She's going out, to hit the town
I'll follow her, I'll track her down
Stare through the window there she is
She's intimidatingly perfect
but did my eyes deceive me?
She was not alone" he is saying she is telling him she is going out with her friends or whomever however he does not believe her so he follows her and discovers her infidelity so at this point he is plotting how to end her secret lovers life.
This whole album is mostly about a relationship gone horribly wrong when it says "She's going out, to hit the town I'll follow her, I'll track her down Stare through the window there she is She's intimidatingly perfect but did my eyes deceive me? She was not alone" he is saying she is telling him she is going out with her friends or whomever however he does not believe her so he follows her and discovers her infidelity so at this point he is plotting how to end her secret lovers life.