The court heard Ms Dawes had a history of mental health problems and had emotionally unstable personality disorder, a form of personality disorder that can result in increased impulsivity, poor self-esteem and difficulty in relationships with others.
Mr Greaney said: “The defendant thoroughly and dreadfully exploited that vulnerability.”
He said Mr Wellings’ abuse of Ms Dawes, and an assault just 11 days before her death, were significant factors in her decision to kill herself.
The court was told police were called a number of times and 999 calls made including on 11 July 2022 when Mr Wellings was arrested on suspicion of assault.
The jury heard no prosecution followed and that Ms Dawes alleged her partner was breaching his conditions of bail in the days that followed by attempting to contact her.
The court was told that for reasons that are not entirely clear, Lancashire Police told her that there had been no breach of bail by Mr Wellings.
The court heard that, in a note found on her phone, she described Mr Wellings as a “monster” and wrote: “The end. I fought hard, I fought long. I went through pain no one could imagine.
“No one will know what I went through. I was murdered. Slowly. They tortured me, till there was nothing left.
“I lost my fight but I didn’t give up my battle. I fought till the end.”
The jury heard she also wrote: “Ryan Wellings killed me. He ruined every bit of strength I had left.”
“The world turned their back on me. I was strong. I had dreams. I had a future at one point. That was taken away from me.”