After a divorce or breakup, it seems that the family goes through the 6 stages of loss. More will be added, but here are some links and resources you may find helpful:
Blended Documentary
Parental Alienation Documentary
My friend Duane has a variety of resources available to help through this time, including:
Youtube channel
Website
Podcast
Dad Talk Today has a support group.
Reunification Therapy
UK resource for helping men break free of domestic abuse