Because he shouted at her straight off the bat, Mika was mostly expecting him to continue snapping at her so when he didn't and even looked at her slightly softer, it threw her off guard and off balance mentally. She listened to him speak and it hurt hearing him say what she did come across as complete lack of trust for him. That wasn't her intention but like with a lot of things, the alcohol that was in her system completely altered her intentions and made her the utter bad guy in this situation.

Hearing him say the woman was fully prepared to rape him made her sick to her stomach but it did make her all the more glad she punched the woman in the face and told her to get off of him. She couldn't help but wonder if he would have been able to stop the woman in his own drunken state properly of she hadn't have gone downstairs after him. All the time she listened to him explain that he was worried about the woman calling the cops on them which she did now sober, understand his thinking. 

Instead of replying, she let Bobby give in his two cents on the situation, and as much as it hurt to have him tell her she would always possessive because she's terrified of losing what little she had, she knew it was completely true. That's why it hurt so much. She also knew she had to accept that what Bobby said about Dean was also true, not to mention that they needed to set boundaries and discuss what it was exactly they wanted out of each other.

She then listened to Dean admit he didn't plan on seeing her again or ask to be here which made her look back down again. "Dean I'm sorry I snapped last night... My distrust of her exploded onto you and if I wasn't drunk I would have dealt with that situation a lot better. I... I understand if you don't wanna see me again... If you'd rather cut me out of your life for good this time... But I can't lose you... Bobby is right, I am terrified of losing the two remaining things I have in my life" she spoke quietly but loud enough for the two of them to hear her.

"I just wanna do right by you and I always fuck it up because I don't see how I'm worth all your time or effort" she continued. "All I've ever wanted since we were kids is to be yours...but I'll u...understand if you feel differently" she said, wishing if her leg didn't still hurt she would have exited the room at that point.