This is my meth addicted husbands 4th time in rehab. I wonder if i should continue or get a divorce.?

My husband is 27 and hes been using for about 4 years now, his most recent period of staying clean was also his longest was one year. During my 3 month stay overseas he relasped and his usage has escalated to the point where he doesnt even feel the need to hide it anymore and blantany lies to me about it. We've been married for a year and a half and honestly i love him to death but i cant continue like this any further. I need all of him and his addiction is taking more and more of him away. I think he has alot of emotional demons and guilt that he needs to overcome but he puts up a wall to hide his weakness and insecurities. His family is broken, his mother died in a car accident 4 yrs ago i which he was driving and that i think is a large part of why he is so sad. Everytime he uses he cries all night, but his brains is not what it used to be anymore and he hallucinates and lose sense of reality. This worries me because i dont know who he is anymore. His younger brother who he hasnt seen for 7 years is serving a life sentence in england and hasnt been home since 2004 so he never got to see their mother before she died. My husband feels so much guilt, and abandonment but he always denies and try to project a indescructable wall to keep him cold and aloof and to keep others away. He has intimacy and control issues in the begining of our marriage but over time he has become more open and less controlling. He is an affectionate person and he loves affection but hes afraid to be weak. His father is now in a defacto relationship with the woman that he was in an affair with while his mother was alive. I dont know if im making up excuses to maybe explain why he uses because i love him and always hope that he'll change or whether they are legitimate reasons to why he finds an escape in his addiction. I want to help him but my only option now is tough love, to leave him and let him make his own decisions and choices. Please advice. Thank you.