A Behavioural Attachment (a.k.a. Behavioural Addiction) is an Dopamine Attachment to a to behaviours. Behavioural addictions include things like sex, exercise, gambling, gaming, binge eating, cutting, etc. All of these activities release “feel good” chemicals (i.e., opiates) in the brain, like oxytocin. As with Substance Attachments, any behaviour that reduces pain, offers release, and triggers the release of the endogenous opiates can easily become a Toxic Attachment, when accompanied by a Dopamine Hit.
Sosteric, Mike and Ratkovic, Gina (2019,BOOK2). Lightning Path Workbook Two: Healing. Lightning Path Press. , especially unit "A" is for Addiction.