I mean, she's smart but i don't understand how she's not thinking of the obvious.

I understand she can't imagine he's her husband and that she's searching elsewhere. But girl, YOU were blind, not HIM. HE knows what you look like and if he flew away, this means he doesn't want to see you or can't : either way, hé won't accept your advance.
It's obvious that she has to go for the one who tries to have nothing to do with her, who treats her badly etc. And the weird one who want to bé far away from her but at the same Times can't look away of her.
Like girl. Connect five neuron.