I kinda wish that that MC dies.
I want her as the main protagonist. That girl is a badass.
He's just a shitty whiny manipulative useless baby.
By the way, in most cases when in dire danger, people tend to get into a fight or flight mentality. Your brain is full of adrenaline, to keep you moving and not end up slowed by your emotions.
That's why you often see people break down in tears after heroic acts, as soon as their adrenaline levels get back to normal.
That actually happened to me, during a car crash, where I was helping people without realising my arm was broken. I cried and panicked like a bitch AFTER the facts.
The only case where you don't get that boost is when you're a baby and still supposed to be in the care and arms of your mother.
So yeah, he's unrealistic and clearly a not-so-discreet way the mangaka found to insult his reader base.
Just kill him, that could even be a motivation for her... and I don't want to see her in another abusive relationship (him emotionally manipulating her by crying if he doesn't get what he wants... yep... like a baby)