Paris is still hanging around hoping he can marry Juliet. Unfortunately, he hasn't had much of a chance to impress her – she's been too busy mourning for her cousin (and for her husband). "These times of woe afford no time to woo," Paris says.
Juliet's grief for Tybalt seemed so extreme to her father that he's changed his mind about waiting a few years before she is married. What better way to alleviate her grief than to force her into a marriage with a man she's just not that into?
Feeling that there's no way Juliet could not be in love with a great guy like Paris, Lord Capulet decides to go forward full speed ahead. He asks Paris if he would be willing to marry Juliet later that week. Paris agrees.
Neither of them knows, of course, that Juliet is already married. The stage is set for a disastrous confrontation.