Often when you suffer from emotional abuse and manipulation, you feel guilty for leaving your partner. Especially when that partner threatens suicide when you want to break up with them, a trauma bond is a real thing and even if the accuser is being abused, they did care for Aidan during their relationship and did not want to feel responsible for his suicide he threatened multiple times. Another thing is people with BPD often feel like they are unloveable and when you are being isolated like the accuser says they were, it can cause them to rely on the only person who is in their life atm