It's not easy book, as I said.
Mrs Dalloway by Virginia Woolf. There are many senses and contexts, certainly.
But I'm not a literary critic. I want to recall only the "turns of heart" of the main characters there:
"But this question of love (she thought, putting her coat away), this falling in love with women. Take Sally Seton; her relation in the old days with Sally Seton. Had not that, after all, been love?"
"To love makes one solitary, she thought. "
"One could not be in love twice, he said"
but the ending is what makes the essence of the book:
"What is this terror? what is this ecstasy? he thought to himself. What is it that fills me with extraordinary excitement? It is Clarissa, he said.
For there she was."