The author (not pictured) was a toxic boyfriend to his ex.
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- I started dating a girl who felt too perfect for me, so I ended things with her.
- Every time I broke up with someone, I ran back to my ex, using her to avoid loneliness.
- She's now engaged to someone else, and I've learned how awful and toxic I was to her.
There are many ways to describe that relationship we always run back to — the fallback option, the backburner relationship, or the Plan B.