Answer:
It depends on the type of unhealthy relationship it is.
If it's abusive physically then you should pack and leave with people with you while your partner is not home.
Mentally abusive you'll probably be able to say "We're done" and walk away but with harsh words following you to your car.
If it's manipulation they'll either let you leave assuming you'll come back or say things like, "If you leave I'll unalive myself" etc