Stop my son from ruining more than he had already ruined.

What Gianna said was right. Arwen couldn't be sure if she had guessed the right person. 

But then, even if she didn't, does that change anything? 

It doesn't … 

Even if that girl in the picture was not Aiden's first love, there might be a woman out there who would be her. 

Either of the two doesn't matter because that time has long passed. In the present, she wouldn't allow anyone to disturb her life… her married life with Aiden. Her husband.

Everything was finally going perfect in her life, and she wouldn't give up on anything she had now —neither him nor this version of herself. 

Especially not for some irrelevant past —one from which both of them have long moved on.