Why do guys stay with girls like this!!

People do things because there is something in it for them, always. This much I've learned in life so far without a shadow of doubt.

Whatever it is, it cannot be good, logic just mandates it. It speaks bad of the person who does it, man or woman, all the same. The possibilities are endless and endlessly... bad... yes, all of them. Such as:

• naive/not smart/'blind'/poor judge of character/didn't see it cause it didn't occur to them to pay attention in life OR
  
• cowardly/desperate/hopeless/insecure/low self esteem OR
  
• lazy and complacent/prefers to knowingly create sub-par life to stay in their comfort zone forever, rather than create a genuinely amazing life. Choosing a less intelligent and/or attractive partner out of anxiety and fear of the risk of being rejected by a truly top-notch person. Lets face it, getting a super hot/smart/popular bf/gf is scary, and people just like to be cowards, play it safe, choose someone they are not thrilled about from day one, just so there could be no anxiety and inner fear. You know, stick with the ugly, fat chick/dude, cause not being terrified takes priority. Dating the model chick/ripped dude they really, actually want to deep down, now that right there is the nightmare of the coward/insecure. So much easier to be with someone less primally desireable, and then blame them for decades... OR
  
• timid/cannot communicate/awkward/weird OR
  
• poor judgment and planning/dpesn't know what they are doing at all/got knocked up and made a baby or five
  

etc. etc. etc. The possibilities are endless. Whatever it is in this particular case, it speaks badly of the person who chose this relationship, stays in it and refuses to even consider leaving ever. A healthy, normal person wouldn't seek and get involved in this type of thing easily, and if they did, they'd leave realistically, not in XX number of years after baby junior graduates from college.