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The question you asked is a complex and sensitive one, involving personal and ethical considerations. In real life, whether someone should intervene in the life of an ex-spouse who is facing difficulties such as homelessness and drug addiction depends on various factors, including the nature of their relationship, the reasons for the separation, and the individual's capacity to help.
It's crucial to approach such situations with empathy and understanding, recognizing that drug addiction is a serious health issue that requires appropriate support and treatment. Encouraging your ex-spouse to seek professional help and providing support, such as connecting them with relevant resources, rehabilitation programs, or counseling services, can be beneficial. However, each situation is unique, and seeking guidance from experts or professionals in the field of addiction and mental health can help in making the best decisions for everyone involved.