Why do girls stick with deadbeat boyfriends?

Anonymous
There's a girl in my class. Very intelligent medical student. She's a little on the chubbier side, but her face is nice. If she lost weight, guys would definitely be all over her, but even without doing that, she should have no shortage of suitors.

She has a deadbeat boyfriend who does drugs, works at a dead-end job, and has below-average looks to boot. She frankly could do a lot better, especially considering that she's still young.

And yet I've seen her turn down a couple suitors who definitely are better for her. I don't get why this happens. It's not just this girl, it's everywhere.
Updates
+1 y
It seems like a lot of people are assuming they're in bliss/she picked the right one when greater than 50% of marriages in the US end in divorce and I'm sure that number is even greater for people in my age group and this isn't even a marriage, to boot.
Why do girls stick with deadbeat boyfriends?
17 Opinion