Having Mixed Feelings About My Engaement

Well im engaged to be married to a friend of mine I`ve known him for 7 years and he was there when i had my daughter, but lately i have been wondering what to do scene we are supposed to be married in July of this year. He is still childish he sleeps all day and he thinks he needs weed to be calm. He dont have a job and i have been going to school for criminal justice and he just does nothing, i love him i do but i dont know if we should get married right now or not my fear is that ill be taking care of him and when i get a job in criminal justice that he will get intimidated and want a divorce please help i dont know what to do i keep having mixed feelings.