I'm kind of happy everything is basically crashing and burning. happy fun times ahead for every previously pampered moron.
It doesn't make sense to assume that OP was 'previously pampered' because it's children who have been sexually/physically/psychologically abused and/or grew up in a home with DV who are at a much higher risk of getting in to and staying in abusive or neglectful relationships as adults.
It seems like the solution is to leave but there are lots of reasons why it's not easy or even possible.
- Learned helplessness, which often stems from long term childhood abuse or neglect, it's also caused by depression and anxiety.
- They're still in love with their partner.
- They still hope that things will go back to how they were before the abuse/neglect started because there are still some good periods.
- They're isolated with no support to fall back on.
- They can't stay in a shelter with strangers because of social anxiety, agoraphobia, ASD or other reasons.
- Fear of leaving because the abuser is threatening to hurt them, their kids, their pets, or themselves, they're threatening to out them if they're LGBTQ, or threatening them with revenge porn.
- Very few shelters accept pets and they don't want to give them away or leave them behind with a violent and possibly vengeful person.
- Insecure immigration status, they may fear being deported and don't have access to help with accommodation or benefits.
- Disability or health conditions which make it difficult to leave, their abusive partner might also be their care giver.
- Not wanting to break up the family unit or uproot the lives of their children.
- Asking friends or family for help isn't easy because of feelings of embarrassment or guilt, in the same way that people often find it difficult to ask for help about other issues.
Because of a combination of these reasons it takes an average of 7 attempts before someone permanently leaves an abusive or neglectful partner.
Edit: I'm not suggesting that OP shouldn't try to leave, these are just some general reasons why some people can't.