Toxic relationships are more of psychological disorders.
I have said this countless times and people don't want to agree. If you see anyone who is ready to be buried in a toxic relationship, then the person has a mental issue. The fact is that, girls can be toxic and also guy. I know of a girl that harm herself anytime she has issue with her boyfriend.
Things are happening. I love the fact that you help your friend but there are some people who have no one to run to.