Yes, absolutely and entirely your fault for falling in love with someone who you thought was being genuine with you and throwing your naivety of the situation in your face..

[ While she is too trusting at times, that's not her fault- it's her caring nature. Of course she was led to Solas like a moth to flame. So like her in every fashion and the trappings of ancient knowledge she'd yet to understand. Did she truly need to know his heritage? He knew so much of it then, when no one else did. ]

You can't help who you fall for any more than I can.