Emotionally Focused Couple Therapy (EFT; The practice of emotionally focused couple therapy: Creating connection. New York, NY: Brunner-Routledge) is an evidence-based couple therapy that aims to create lasting change for couples (Clinical Psychology: Science and Practice, 6(1), 67-79). Although studies have demonstrated strong results in follow-up (Journal of Marital and Family Therapy, 28(4), 391-398), less is known about relationship functioning across time after therapy has ended. We modelled change in relationship satisfaction and attachment from pre-therapy through 24 months follow-up in 32 couples. HLM results confirmed a significant growth pattern demonstrating increases in relationship satisfaction and secure base behaviour and decreases in relationship specific attachment anxiety over the course of therapy and across follow-up at a decelerated rate. These findings support the theoretical assumption that EFT helps couples engaged in therapy create lasting relationship satisfaction and attachment change.