Well when that no good loser proves he's not worthy you will be there to pick up the pieces.
I put myself in a bad spot with that mindset back when I graduated college. Apologies as I never quite found a succinct way of telling this story.
Towards the end of my freshman year of college, I got dumped by my girlfriend via email. Being a dumb teenager, I didn't handle that particularly well. My grades went in the tank. Sophomore year didn't start off great, my roommates were lazy and I in turn also got complacent. Eventually I had to admit that I wasn't giving full effort and abruptly moved out. New roommates were nerds and suddenly my grades were back on track.
There was a cute gal in my class who lived in the same area of campus but I never had the nerve to talk to her. One day it rained unexpectedly. I left in the middle of class to buy an umbrella so I could offer to walk her back. We had a friendly chat and I thought I managed to give off a good first impression for once. A few days later, I asked if she wanted to study for the midterm together and she gave me a dirty look and declined. My friends were watching from afar and were like "WTF did you say to her?"
I used that as motivation to study hard for that exam. The mean was in the low 40s and the professor admonished the class. Being petty I made a point to walk by her and loudly tell my friends that I got 100%. I didn't I'd ever talk to her again.
But start of junior year, she befriended me again and we'd start hanging out. Unfortunately I'd learn that she was still with her high school boyfriend, but that seemingly wasn't looking promising. Maybe a month before graduation, she asked if I wanted to grab breakfast and then she told me that she had landed a job and would be staying in town (job market wasn't great, the other gal I was interested in wasn't able to find a local job and moved to Texas).
My brain got in the mindset that it was only a matter of time before she dumped the other guy (that happened a few months later) and that I'd be next man up. Sadly I didn't realize that I had basically been friend zoned the previous two years. She'd end up dating/marrying her new boss.
A few years later I ran into almost a carbon copy situation with another gal who bore some resemblance. But I decided that I had done that Choose Your Own Adventure before and figured I knew the outcome, so I never viewed this one romantically even though all of our friends thought something was brewing.