I feel your pain and sense of betrayal of the love and trust you thought you shared. (From a Biblical perspective) If there is no actual abuse in the marriage - then do everything you can to release the anger, which turns to bitterness if you don't release it, and stay with your spouse.
I also agree that there should be boundaries in place to protect you. I don't believe it is necessary for you to remove yourself from the marriage in order to stake out the boundaries or to protect yourself. By being transparent about how you feel about the dishonesty, stating exactly what you expect - complete honesty - and by calling your spouse out on any confirmed untruths (so he/she is not misled into believing that he/she is "pulling the wool over your eyes"), you have a place to begin maintaining your 'separateness' from the deceit, games, and unhealthy dynamics.
However, don't expect it to change him / her. Your spouse will only make a change if HE decides at a heart level that he must change. Unfortunately, most people who chronically lie do NOT really want to change, and they are generally gifted at manipulating other people, even engaging others' sympathies for their 'problem', while they continue to do everything possible to destroy the trust necessary to that relationship.
Do what you have to NOW to ensure you have the skills necessary to support yourself, in the event your spouse decides he is unwilling to stay with you as you attempt to seek a relationship without negative dynamics that do not serve you, your spouse, or your marriage. Finally, you will NEED to strengthen your relationship with supportive people who have healthy relationships with other people. It will make you stronger. It also results in your being less likely to be pulled into the negative patterns of interacting that your spouse employs.
I sincerely wish you the best.