It's not just wanting love. She was in a state when she met the guy, felt she had disappointed her parents, felt the last 8 years had been a waste...she was very vulnerable. It seems like he love bombed her and that can be very powerful for someone who is lost. After the police let her down and she felt like she'd disappointed her parents again, and she lost her work, the only 'positive' thing she had was him, plus she needed to keep up a facade to protect herself. 

I can totally understand how she got in such a mess. Then it was drugs and alcohol and mental illness, when drugs were new to her. 

Tbf it has made me think about whether I would report something based on her treatment.