The fact that she bit you when you last attempted this type of kissing sends a strong message that she did not like that particular kissing. Although we advocate talking about likes and dislikes rather than biting or other physical means, she perhaps was sending you a message that her spoken words had gotten her nowhere. Of course, we don't know this, we can only guess since we do not know the two of you. It was interesting, however, that you knew that she did not like the behavior, and yet you continued to do it. Sometimes when people have been together for so long, they lose sight of the fact that they are, after all, individuals with their own ideas and preferences.
Lovers get along best when they are willing to talk about the differences they have.
As far as you losing interest in kissing and having sex after being bitten, it made sense to us. You may not have been very sure about why she actually bit you or whether this would occur again. This might have made you a little nervous or uncomfortable. Nervous and uncomfortable don't go along with good sex. We believe some clearing of the air might be beneficial.