Staying with your rapist husband/boyfriend is the norm. He might beg for forgiveness and say he won't do it again. He might say he didn't understand you when you said no. He might threaten to kill you if you open your mouth one more time. He might do all of those in the same five minute span.

Almost every women I am close to has been raped or assaulted.

What part of this do you specifically not understand?

https://en.wikipedia.org/wiki/Battered_woman_syndrome

From the little that I know:

Every abuser in my personal life whom I've learned about--most of whom I'd also met and spent time with before learning of their deeds--are extremely charismatic people who make active efforts to both isolate their partner from their social circle as well as do things externally that increase their reputation amongst both their peers and the peers of their partner. The people who batter, violate, and terrorize their partners are, with unusual frequency (in my experience), the same people who pick up the tab for everyone at the bar, who reliably buy people gifts, and who offer trusted advice and counsel in trying times.

Now, as to why these abusers are like this, that's a more complex thing. I'm not qualified to speak on it, but in the examples I've seen in my life, they're often people who have narcissistic personality disorder, where they're extremely attached to being seen in favorable lights by those around them, and as a result, react viciously to those who challenge that (oft fictitious) image. (This isn't always a conscious process--to put yourself into their shoes, imagine you're inextricably convinced that everyone is trying to defame you, abuse you, and tarnish your reputation at all times (which is probably true for the abuser, because in trying to prevent such fiction, they do monstrous things that fulfill that exact prophecy), so you need to constantly prevent it from happening by becoming trusted and loved by every means necessary, or else.) However, in an effort to maintain this image, they become very well-regarded by those around them, which makes the victim of their abuse sound insane when they try to call them out.

These people also frequently attach high-value people (such as the children they have with the abused) to them so that they are more difficult to harm, hold accountable, or separate from. I have never, ever heard of an abuser who didn't actively maintain an external factor that made them incredibly difficult to prosecute ("but he has kids, and the kids adore him" / "but he donates so much of his time and money to local charities" / "but he's putting X through college", etc). Putting the abused OR people the abused cares about in financial dependence with them (paying for school / rent / resources for them or their lives ones, isolating the abused from avenues to financial independence, etc) is also very common, if the abuser has such resources. Then, the abused trying to get help is made to become someone who's trying to "defame" the abuser, "rob" their loved ones of financial assistance that they depend on, "steal" the children from their father "whom the kids so love". In the abuser's mind, if their being imprisoned means someone is immediately put in harm's way by their absence, they are safe.

The opportunities for the abused to be made to feel completely insane by the world the abuser has created around them are innumerable; the goal of the abuser is to make the victim sound like a monster for trying to challenge the abuser's authority, and usually, by the time the abused catches on to the situation they're now in (during which time the abuser has been nothing but sweet and caring), the abuser has already completed the process, and that world now has extreme consequences if the abused tries to escape it. They're no longer leaving their partner--they're leaving their entire family, their friends, their finances, their entire support network, because the abuser has ingrained themselves into all of it, and done all they can to make their authority unchallengeable (or, at least, convinced the abused of such).

Combine that with the abuser very often making a habit of encouraging the abused to doubt their own judgment, telling them they're stupid or worthless (in words subtle enough that you or I would believe them), or finding people from the get go who already lack such confidence (which the abuser may not even realize is what they're doing--they're just looking for someone who doesn't seem like a threat to them, while simultaneously being incapable of believing that they, themselves, might be that threat, as a result of being blinded by their own narcissism. Which is another factor--how do you convince someone they're being harmful when they're incapable of believing that they have the capacity to harm? The abusers often believe the same lies they tell their victims, and tell them with unwavering conviction.)

Do you have anyone in your life who you hold in very high esteem, whom you are very close to, who you've also heard ill of? When has your gut response been to believe the person speaking ill of them, instead of your trusted, caring, friend, who you've known for years, who would "never do such a thing"? It might be someone so close to you that believing their victim would feel like buying into a conspiracy theory--which is exactly the circumstance that the abuser is trying to maintain.

That's a big part of why.

If you are curious enough to read a book about this and related questions, Unspeakable Things by Brooke Nevils (who accused Matt Lauer) really opened my eyes on this.

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It turns out that rapists like to enter relationships with damaged people, and damaged people have trouble leaving violently abusive relationships. I know understanding isn't a strength of yours, but hopefully this helps.

>nor am I blaming anyone

Saying this doesn't immunize you from valid criticism of victim-blaming. Your question is basically "Why would the victim let it happen again?". I know you're "just asking questions", but we all get the message you are sending here.

Money.

Usually the lawsuits start when the money is more likely to come from that, than from enabling the behavior.