Some part of Liam recognizes and loves Ruby still, but he still cant remember her or anything that happened in their past. He confronts her about his memories, and somehow, by accident, Ruby manages to return his erased memories to him.

Does Liam get his memories of Ruby back?

After Ruby is taken captive by Rob, a rogue league agent, Liam together with the rest of the group comes to her rescue. Although his memories of her had been taken away by Ruby, his feelings had not, causing him confusion until Ruby accidentally restores his memories during a passionate kiss.

Does Ruby make Liam forget her?

Over time Ruby reveals her true ability. They eventually find the Slip Kid, whose real name is Clancy Gray. ... Towards the end of the book, Ruby erases all of Liam's memories of her. She does this because she fails to see any other condition on which he'd willingly leave.