"I think he's Will 's partying a lot in Cabo. I think he's running a brothel. I don't know what he's doing"

In this quote, Bradley Cooper is revealing his ideas and suspicions about his friend Will's habits in Cabo. He thinks that Will is partying exceedingly and perhaps engaging in prohibited activities, specifically running a brothel. Cooper's use of the word "believe" suggests that he is not totally sure about these assumptions, but they are based on his observations and potentially reports he has actually heard. The tone of the quote is rather playful and teasing, suggesting that Cooper might not be totally serious about his accusations. In general, the quote portrays a sense of curiosity and intrigue about Will's actions in Cabo.