going crazy with my lying fiance'--help!!

I have been with my fiance' for 5 years and we are getting married next May. He has been lying the whole time we have been together. He lied about gambling, marijuane use, etc. He says he grew up this way because he had a really strict father, and he can't seem to break out of the cycle. He wants desparately to stop lying, and says he will never lie again whenever he gets caught, but things keep coming up. I think he is scared of getting yelled at, but I would be so much less upset if I knew without him lying.

I have become obsessed with what he lies about- mainly obsessed with whether or not he has or will cheat on me. I have never had any evidence that he has, but I cannot stop wondering if he has since he has lied about so many other things. Does anyone have any tips? I want to either feel confident that he has not cheated, or find out if he has (whenever I ask, he completely denies it and says he would never do that)... I am starting to feel crazy because it is all I think about!! Please help!!

Perhaps try to explain that trust is the foundation of a lasting relationship. When he lies (even about trivial things) it chips away at that trust. When the trust has eroded enough you will question bigger things, such as fidelity. If the trust is strong, you will have no doubt of his committment to you. Explain to him that by telling the truth about even the small stuff that your foundation wll be strong.

I hope that my advice makes some sense to you.