While your girlfriend has decided to come back, this isn’t the proper criteria for continuing the relationship. She has not committed to any therapy, and the likelihood that she might just change her mind again is very high — leaving you completely vulnerable. Unless she is willing to work on herself this situation isn’t likely to turn around. What is different? Your kindness and willingness to get back together without her making some substantial changes isn’t something to bank on.
Offer to go to couple’s therapy with her and get this situation in front of a professional who can help sort this through. Your family has had a front row seat to your pain — and they don’t want to watch you go through this again. If she is unwilling to help herself it isn’t likely the foundation of your future with her can be more than what you’ve experienced in the past.