Counterpoint...
I never said "never" have sex with someone else so please stop reading something I have not posted. Nor have I said that Lori is a "whore". What I have said is that Lori sleeping with Shane 3-4 weeks after the presumed death of her husband is too soon for my tastes, especially considering there is plenty of "surviving" to do in that time like finding food, shelter, weapons, other survivors, etc. I have said that I cannot relate to Lori and her actions and do not have much of any sympathy for her at this point.
My hunch is that Shane is a scumbag and he probably did lie to Lori about Rick's supposed death. For all we know, Shane, Lori and Carl piled in a car and went to hospital to pick up Rick and Shane told Lori to stay in the car with Carl while he went to go get Rick and he came back and lied to her about Rick being dead. Something along those lines will help "redeem" Lori's character immensely. Hopefully we find out this week what really went down.
I am loving this show and all the discussions it has sparked!