Excerpt from chapter 21 from Jane Austen's Persuasion:
She felt a great deal of good-will towards him. In spite of the mischief of his attentions, she owed him gratitude and regard, perhaps compassion. She could not help thinking much of the extraordinary circumstances attending their acquaintance, of the right which he seemed to have to interest her, by everything in situation, by his own sentiments, by his early prepossession. It was altogether very extraordinary; flattering, but painful. There was much to regret. How she might have felt had there been no Captain Wentworth in the case, was not worth inquiry; for there was a Captain Wentworth; and be the conclusion of the present suspense good or bad, her affection would be his for ever. Their union, she believed, could not divide her more from other men, than their final separation.
What is the meaning of the sentences written in bold?