Secrets is about... well secrets, no? Lori is juggling a complex pile of lies. She is pregnant because she bumped dirties with Shane, and but Shane does not know he is the baby daddy. On the other side of the farm Hershel is lying by omission about the zombies shambling around in his barn. The question this episode begs is: What is the right truth?
Let us saw into Lori's rational for lying. Lori is a crafty woman who is otherwise inept at surviving the zombie apocalypse without moving a man in her life to protect her. So, when the end of the world begins and she has no reason to question Rick's death, she begins a romantic relationship with Shane. This is a smart move on Lori's part because wrapping her legs around the closest alpha male she secures her safety. But on the other hand, Lori is also manipulated by Shane, who lies about the certainty of Rick’s death. What Shane's lie produced that Lori's did not is a truth effect. In other words, what Shane's lie about Rick opened up is a space where Lori could cling to the kind of man she is predisposed for. A man that doesn't need her approval, or reassurance to bolster his self-esteem. Shane and Rick are caught in a subtle dialect where Lori is the medium of exchange (I argued this more fully in my critique of E1S1).Shane's lie is a lie, but what it nonetheless supported the capacity for Lori to develop real feelings for Shane.
The state of the situation shifted in such a way where Lori's emotional validity became less important than her survival. Rick arrives and Lori freaks. So in order to protect herself, she lies to Rick about knocking dirties with Shane in order to avoid the conflict that would put both men into a fight to the death. On pure survivalist level this was a smart move that avoided conflict which may have left her with one man to protect her instead of two. It is important to note that this is one of the first major deviations from the comic; Shane does not survive past the first camp in the comic.
What happens in art, in science, in the true (rare) politics, and in love (if it exists), is the coming to light of an indiscernible of the times, which as such, is neither a known or a recognized multiple, nor an ineffable singularity, but that which detains in its multiple-Being all the common traits of the collective in question: in this sense, it is the truth of the collective's being. The mystery of these procedures has generally been referred either to their representable conditions (the knowledge of the technical, of the social, of the sexual) or to the transcendent beyond of their One (revolutionary hope, the lovers' fusion, poetic ec-stasis...)...A subject is then a finite moment of such manifestation. A subject is manifested locally. it is solely supported by a generic procedure. Therefore, stricto sensu, there is no subject save the artistic, amorous, scientific, or political... The existence of a truth is suspended from the occurrence of an event. Alain Badiou - Being and Time (p. 17)
Check out the next article in this series: Philosophizing The Walking Dead S2E7 Pretty Much Dead Already and Post-Apocalyptic Group Therapy