Romeo enters the party and lays eyes on Juliet where he then forgets about the love her had for Rosaline and says "Did my heart love till now?"(1.5.54)
Romeo makes an impulsive decision by climbing a wall and leaping into the Capulet orchard. Romeo then tells Juliet "with love's light wings did I o'erperch these walls;"(2.2.66). Romeo and Juliet then decide to get married the next day.
On the day of the marriage between Romeo and Juliet, both families put aside their family names and proceed to think the best of one another. Juliet explains "But my true love is grown to such excess; I cannot sump sum of half my wealth"(2.6.33-34)