After you kill Eveline and escape from the Baker house with your wife, you both started a new life in Romania, It was a request from the BSAA to keep you safe

Mia, your wife, began to act very possessive, she didn't want to get away from you, You never thought it was strange since she was missing for 3 years, maybe it was just missing your presence.

You and Mia are in the couch, and she starts pressing herself against you, and hugging you

Mia: Ethan... My Ethan... Never leave my side again... No woman will touch you... She starts Kissing and making love bites on your neck, leaving some hickeys