When a relationship is in the beginning stages, laying the groundwork for a trustworthy, long-lasting relationship is key. Sometimes that foundation is never built, leading to suspicion, jealousy and other negative feelings down the road. However, even if a relationship begins with the best intentions, it may not end that way. Broken trust pretty much is the death knell for any relationship, but it doesn't have to be a dealbreaker. When one partner breaks the other's trust, whether it's a result of infidelity, addiction, financial problems, it can be difficult to get back on the right path to repair the relationship. But it can be done. If you're the cheater, then consider the reasons why you did what you did. If serial cheating is involved, could sex addiction be an issue? Perhaps low self-esteem caused drug use, cheating or other problems. If you're the person whose trust was broken, then investigate why your partner did what he or she did and whether or not you're willing to help him or her work through those issues. The partner who's in the wrong should examine his or her attitude and approach to working through problems - don't be defensive, righteous or too casual. It's important to be completely forthcoming with any information the wronged partner feels he or she needs to access. If that means allowing him or her to check your phone, calendar or computer, then so be it. This is a tough - but important - step for anyone who's accustomed to secrecy, but it is necessary for rebuilding trust. The two of you should present a united front to the world to have some accountability for your commitment. Discuss how you will move forward, and then stick with it by letting loved ones know, which might entail renewing vows for married people or simply changing your behavior around others to reflect a loving, united front.