Why do some people allow themselves to be mistreated?

One of my closest friends recently met someone and soon after she declared that she wanted to get engaged to him. I couldn’t understand, but whatever. Now 5 months later, she’s telling me that he is “abusive”. He disrespects her in front of their mutual friends, he looks for excuses to start arguments, he’s sexually pushing her to do things she’s not comfortable with, he goes through her phone, he constantly brings up her past and judged her for it, he’s asking her to change her hair colour and get a tan because he likes it (like wtf?) etc. I told her to GET THE FUCK OUT, because he is ABUSIVE ASF, but she says that she can’t do that and basically is signing herself up for a shitty life with him. I’m so frustrated with her. Now, she is really beautiful and smart and not the “insecure” type, so why is she allowing it?
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