Under this influence, honesty can be very hard to come by and communication likely gets very confusing and difficult. Your partner, especially, has to try hard to stay away from telling you little white lies, because any level of dishonesty in this relationship easily takes on larger proportions and becomes a big deal. Your partner may even be passive-aggressive with you at times, pretending things are fine when really they're not, jabbing you with little hurtful comments.
And don't misunderstand this tendency -- it's not that they're a bad or a mean person. It's just that something in this connection pushes them to behave in that way toward you. After all, you might not be perfectly honest with them, either; they might try to talk to you about their feelings or their problems, and you fake interest or concern because you really don't get what they're talking about or why they feel like they do. Even though you don't mean this in a bad way, it could be really hurtful to your lover to feel like you don't honestly care about them or their feelings. Try not to argue about it; a better way is to admit to each other that you really aren't operating from the same page, and see if you can't talk things out and bridge the gap between you.