Do you want your marriage nursed back to health? If you want your marriage restored it will take some effort on your part. Stop peering over the fence at your neighbor, and put your eyes back in your own yard where they belong.
First, the offended spouse needs to forgive completely (see my article, forgive a cheating spouse), and secondly the offender has to understand why he strayed from the marriage bed in the first place. Infidelity is only a symptom of a greater problem within the framework of the marriage.
If you have been unfaithful or have anything else pulling you away from your spouse, ask yourself why? What am I doing that would cause me to be disloyal? Don’t blame your spouse for your weakness. Grow up and take responsibility.