Dear Shonta911: As others have pointed out in their comments, it sounds like you are not only dealing with jealous fears, but also with weakened trust because of his lying about money (and possibly other relationship habits too).
It is so important to continually bring yourself back to the present moment and what you DO know in your relationship.
If you suspect that he is cheating (and this is why he is lying about money), pay attention to any inconsistencies that you find in other areas of your relationship. The differences between what he says and what he actually does are helpful to note. Unexplained and significant changes in how he communicates, treats you, dresses, etc. are also places to look.
There is a fine line between gathering information to either support or discount your suspicions that your man is lying and simply spying because your jealousy has gotten the best of you.
When you feel compelled to look through his cell phone or bank account, pause before you act. If you are only doing this because you feel jealous fear or you are thinking about the last time he lied to you, it might be wise to calm yourself down first.
Make it a point to look for ways that he might already be showing you that he is trustable and remind yourself of that. If you can't find any signs that he is being more honest and open with you (about money and other things too), it *might* be a sign that he is continuing to lie and possibly cheat.
The bottom line here is for you to pay attention and make decisions about how you act and what you say from a place of clarity and choice (not just a reaction).