Stages of Relationships by Months Stage 1: The euphoric stage - 6 months to 24 months (2 years) Stage 2: The early attachment stage - 12 months (1 year) to 60 months (5 years) Stage 3: The crisis stage - 60 months (5 years) to 84 months (7 years) Stage 4: The deep attachment stage - 84 months (7 years) and beyond.