Amelia genuinely loves Owen, and she wants to be with Owen, Scorsone tells EW.
She just gets terrified.
What happens involves Merediths (Ellen Pompeo) feelings about her sister-in-law marrying her best friends ex-husband.

Credit: Byron Cohen/ABC
Meredith and her have a huge blowout on the wedding day, McKidd says.
It gives Amelia an existential moment of, Is this the right thing?
Is this even the city I should be in?
Is this the life I should be living?
Bad moment to have an existential moment, but thats what happens.
That sends her into a tailspin.
She doesnt understand, and she feels really betrayed and thrown under the bus.
But the story line will provide some great comedic moments during the season-ender.
The finale is extremely emotional, the actress says.
Its the culmination of a lot of emotional arcs that have been building Callie-Arizona, April-Jackson, plus Amelia-Owen.
Thats exactly what happens.
Its very, very emotional.
Theres something for everybody across the board.
For Alex [Justin Chambers] and Jo, Alex wants to know why it is a no.
And he confronts her about why it is a no.
Its a good finale.
I wouldnt say its over-the-top like the shooter episode, but I think its classicGreys.
I think viewers will be very happy.
TheGreys Anatomyfinale airs Thursday at 8 p.m.
Check back after for scoop on season 13!