From the way it looks, on any taken path, Liz decided not to disclose the ordeal to Sam:
Ntr - she became addicted to Matt's cock, so she probably tought Sam will try to stop her if she founds out.
Happy - she eventually accepted and enjoyed the situation, but not as addicted as her version in the NTR route.
Lover - she probably does not want to involve Sam on her problem and decided to deal on it on her own. However, unaware as she may be, Sam still acts base on her intuition and the fortune-telling result.