I never understood why women stay in physically abusive relationships, I'm not judging I just really…

I never understood why women stay in physically abusive relationships, I'm not judging I just really don't understand...my mom first husband used to beat on her and from a kid she always told me that love doesn't hurt and if he hits you once he will do it again, so I know better, and my friends boyfriend shot her in the head in 2011 and killed her, it's not worth it ladies get out if you are going thru this, my heart hurts for my other friend and sadly she's not done she will be back later tonight