Stanley lets Stella know that he has learned somethings about Blanch. What things?

Stanley tells Stella that he has learned the truth about Blanche. He has been checking her background, and has discovered that she is no lily-white virgin. Blanche lived at the Flamingo, a hotel known for not interfering with its guests activities, but she was kicked out just the same when all of Laurel ran Blanche out of town on a rail for her own epic fornications. She didn't resign from the school but was fired before the term ended, because she had been dallying with a seventeen-year-old boy