Why does my friend defend her toxic boyfriend no matter what?

One of my best friends is in a toxic relationship. I know it's none of my business, but she calls me crying ever so often telling me he hit her or confiscated her phone. So she makes it my business.

Her boyfriend has serious jealousy/control issues, is unkind to us, and none of her friends or family like him. But when people try to gently point these things out to my friend when she vents to them, she denies it to death and says he's the kindest, most wonderful person ever.

No one feels like they can get through to her. She won't hear ANY criticism of her boyfriend even if he's rude to us or her. She is in denial of who he is. My friend wants help from the people around her when they fight and break up constantly, but she is so defensive over him being a "good" person that she won't accept the help.

Why are some people in denial or defensive over their toxic partners? What can I do when my friend vents to me?

Why does my friend defend her toxic boyfriend no matter what?
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