During which stage did erikson believe that adults seek someone with whom to share their lives in an enduring and self-sacrificing commitment? marriage versus lack of commitment commitment versus affiliation loneliness versus commitment intimacy versus isolation

I believe the answer is: intimacy vs isolation

intimacy vs isolation refers to the stage when people make various efforts in order to establish meaningful relationship with another people.
If the efforts are successful it would be resulted in intimacy, if the efforts fail it would be resulted in isolation.