It is too bad that such a tragedy happened to your ex. Some people are not that stable and not that strong spiritually. But, that is now in the past and can not be changed. One can only learn from the experience and move on with ones life. One can not control what other people do. One can not stay in a bad relationship just because someone has self destructive tendencies. One can just work hard on oneself to make sure that you become more stable and stronger spiritually.

One can use meditation along with mind-body exercise or other exercise(not done excessively), eating a healthy diet with supplements if need, and getting adequate rest to try to build up your spiritual energy. Life can be quite challenging and one sometimes must focus just on taking one step at a time and one day at a time so as to weather the storm one may find oneself in at the moment. Be glad that you are a live and still can make the most of your life from this time on. Confidence can come as one builds up ones health and spiritual energy. Just hang in there and keep fighting to improve your position in this world.