Where's my mom? Didn't you say she was locked up?
She must have escaped! Look, there's a whole in the wall!
I can't even look at her.
If you say to run, I'll run and love you forever.
Alex takes Lena to the Crypts, where everyone who has "mental issues" is kept captive. Alex knew that Lena's mom was there and he wanted her to know the truth.
When Lena wakes up the next day, regulators are in her house. They talk with her family discussing how Lena is infected with the love disease. Lena argues that she is fine but they lock her up. Alex goes to save her so they can leave to the wilds as they planned.
As Alex and Lena run toward the gate to go to the wilds, Alex gets shot. He gets surrounded by regulators and can't escape them. He tells Lena to run. To escape from the inescapable society while she still can.