What is the best way to help this situation?

The healing work, by targeting all involved here, can deal with all the individual pieces of the puzzle and that is the very best way to proceed. Because the darkness is relentless in pursuing its dark intentions, and the Law of Karma, although dispassionate, is also relentless in forcing the issue when there is undone healing need, and a current situation presents an opportunity for old business to return and start buzzing to get people's attention there is something needed to happen. Even though that is adding insult to injury, it nonetheless is the working of the world given the many, many, sources of darkness and negativity that may well converge and complicate things all the more. This is fixable. That is the thing to focus on. The key is to get the healing underway and give it a priority so it gets dealt with once and for all, so both parties reach higher ground in terms of strength and stability. That will allow love to re-bloom and joy to return in the relationship by removing the tensions and great inner disquiet that will not be understood intellectually, but is the reason for great emotional discord within both individuals because of past history that needs to be set right. Getting divine help for this in a serious concerted fashion is the very best way to deal with this effectively.