WDIV4 just read a statement from JB's family (mom/siblings). Summarizing: She was a moral, ethical person and would have ended her marriage rather than live in an open marriage. They said to treat any such talk with disbelief. The family said theirs was not a perfect marriage and noticed a change (for the worse) in the marriage over the last several years. Further, they indicated that there was no other man in JB's life. Lastly, JB was big on family and the family indicated they will always be there for JB's children.
I'm sure the complete statement will be on the WDIV website soon.