What evidence do we have that Romeo went to Capulet's party to see Rosaline?

In the beginning of Romeo and Juliet, it states that he is in love with Rosaline. A little later, the Capulets are having a feast. Romeo thinks it would be a good idea to go, just to see his dear Rosaline. And because he was a Montague, he and his friends wore masks to conceal their identity. At the party, Romeo caught a glimpse of Juliet, where he automatically fell in love with her, therefore forgetting Rosaline.

But his original reasoning for attending the ball was to see Rosaline, who he thought was his true love. We know this because a servant of Capulet's asks Romeo to read the guestlist to him. since the servant is illiterate. This Romeo does and reads that one of the guests will be Rosaline. Benvolio then says, " At this same ancient feast of Capulet's sups the fair Rosaline whom thou so loves with all the admired beauties of Verona. Go thither and with unattainted eye, compare her face to some that I can show, and I will make thy swan look like a crow." Romeo replies, "I'll go along, no such sight to be shown, but to rejoice in splendor of my own." In other Words, Benvolio wants Romeo to look at other girls, who will take his mind off of the unattainable Rosaline, but Romeo says he will go, not to look at the other girls, but to enjoy the sight of Rosaline.