He is furious. He made the mistake of putting his honour on the line when assuring Paris that Juliet would agree to marry him, and now she is making him look like a chump and giving no coherent reason for it.
They plan for Juliet to marry Paris
Paris wanted to marry Juliet. Romeo succeeded.
Juliet was suppose to marry Paris.
Paris has to get Juliet to like him.
Juliet's Dad, and her entire family in fact, want her to marry Paris.
Juliet's father, Lord Capulet, insists that Juliet marry Paris. He believes that Paris is a suitable match for his daughter and does not understand Juliet's hesitation.
Romeo isn't destined to marry anyone. He does fall in love with Juliet. Juliet is the one that is destined to marry Paris.
Juliet threatens to marry Romeo before she would ever marry Paris.
He promises Paris that Juliet will agree to marry him. He does this without consulting Juliet first.
After Juliet refuses to marry Paris, Capulet tells her that she will marry Paris or she will no longer be welcome in his home.
her report was that she was terribly sick and could not attend
He wants his daughter to be happy with the marriage agreement.