I once had a boyfriend who seemed to lie to me all the time. I figured out that he would tell me whatever he thought I wanted to hear just to make me happy. It didn't matter if it was the truth or not. While I appreciated that he wanted me to be happy, I would always find out the truth. Then I would be more upset than if he had told the truth from the beginning.
I think some guys are egotistical enough to think they will actually get away with a lie, and honestly don't think their girlfriend knows. I'm not saying all guys are this way, but I know some who are. The above mentioned boyfriend definitely was.
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