Anne is depressed after Marianne leaves in January. During a visit from Tib Anne tells her that she is no longer as interested in "sleeping with" other women. (Presumably based on the explicit pledges she exchanged with Marianne.) It's unclear whether this is meant to be euphemism or literal but the context suggests the former. Tib teases her about this and continues in the mistaken belief that she will be Anne's life partner at some point. But Anne continues to be less than honest with Tib about her commitment to Marianne, of whom Tib continues to be jealous.