S6 Irritated with Liza

I'm on S6 E6 where Liza just fantasized Josh coming into her room and being all over her, when it was actually Charles. What's wrong with her? Seriously she has had so many relationships and men in her life, keeps going back and forth. She kissed Charles when she was with Josh, had multiple fantasizes about him. Now she's with Charles and is thinking about Josh. When Charles and his wife were maybe rekindling, Liza was jealous and even cried about being in love with Charles to Jay. Now she's pulling this. Is she 41? I think having a baby so early in her 20s and being married early really messed her up psychologically. I'm so sick of her and this show.