How is this possible? If my sister says you are a lesbian?

The young man was in for quite a surprise because he has liked that girl for a long time, she is a friend of his sister and she has always told him that he had no chance because that friend of hers is a lesbian... but today she made it very clear that she is not a lesbian at all, she may be bisexual, anything is possible, but she is not a lesbian at all.