32-year-old Danielle Epstein says she is running the London Marathon on Sunday in honor of her ex-boyfriend after leaving him because his cancer battle was “damaging” her mental health.

When I was 8 years old. A couple of 10-year-olds used to bully me on the school bus. One day I started crying to my dad saying I didn’t want to get the bus. I told him why. He sat, drinking whiskey and playing chess at 9 am. Didn’t even look at me cry. He replied…