What Do You Do When Your Boyfriend Is Lying To You?

Well, if you're very sure that you're boyfriend is actually lying to you, then prove that he is lying to you, and if he still doesn't admit it, then just leave him, and tell him it's over until he starts telling the truth. :)
Sorry if this doesn't help, this is just what I would do if I were a girl and in this situation.

When people lie they tend to look to the right as a reflex because of which part of the brain of the brain is used to come up with a lie. Might not work on everyone, but it's proven to be a pretty accurate way for me to determine when I am being lied to.

I've also found that if your boyfriend drinks that if they become quite intoxicated they become more likely to tell the truth. Especially if you ask them while they've already begun to fall asleep. Haha. It's worked for me, too.

If you really love him ,give him a chance and let him tell you why he lie to you .But if you don't like him any more, let him go.

Don't talk to them for like a whole week.