Because Paris was married already, but his wife died, so Lady Capulet knows that he has experience with marriage and that he is going to be a good husband.
That was just made up; it doesn't say anything in the text about Paris having been married before. The reason the Capulets are pushing for a marriage with Paris is that he is nobility-a "county"-whereas although they are rich (they "have the chinks") they are not noble. Capulet in the play is just "Capulet" not "Lord Capulet" as many people want to call him. They are a strictly middle-class outfit.
Lady Capulet tells Juliet that she has arranged for her to marry Paris.
Lady Capulet encourages Juliet to love Paris, a wealthy nobleman whom she has arranged for Juliet to marry. Lady Capulet sees him as a suitable match for Juliet and believes that their marriage will bring her happiness and security.
Lady Capulet brings the news that Juliet has been proposed to by Paris and that they have arranged for Juliet to marry him. She believes this will bring great happiness and prosperity to their family.
he tells his wife to tell Juliet that she is getting married to Paris
that he wants Paris to woo Juliet, but she is currently too young
Nurse and Lady C believe Paris is a good choice for Juliet to marry. Nurse feels Paris is a "man of wax" and Lady C thinks Juliet is at the perfect age to marry.
By comparing Paris to a book, Lady Capulet encourages Juliet to consider him as a potential suitor for marriage. She uses the analogy to suggest that Paris is a suitable match with good qualities that would make him a desirable husband for Juliet. She hopes that Juliet will be receptive to the idea and ultimately agree to marry Paris.
Count Paris visits Lord Capulet in Act I, Scene II, of Romeo and Juliet, to ask Lord Capulet for Juliet's hand in marriage. Lord Capulet stalls, telling him to wait until Juliet is older.
A wedding. Capulet and Paris have agreed between them that Juliet will marry Paris. Mrs. Capulet happily announces that on Thursday next at St. Peter's church, Paris will make her a joyful bride. Nobody asks Juliet how she feels about all this.
Juliet is upset and refuses to marry Paris. She tells her mother that she cannot love him and that she would rather die than marry someone she does not love.
Lady Capulet supports Juliet's marriage o Paris.
They want Juliet to marry a man named Paris, because he comes from a rich family. So, The capulets will become even richer.