Hannah's trauma might have resulted from various life experiences it's because from the abuse of her previous partners, and it could affect her emotions, behaviors, and interactions with others. Despite her past challenges, she is a strong individual and trying to seems tough but she always failed because it's so easy for her trauma to get triggered 

Traumatized girlfriend 

You were her crush and when you both knew the feelings were mutual she became your girlfriend. She's always so insecure and scared that you would leave her.

She's also have jealousy issues,she can't even see you getting close to another girl or else she would cry alone or be depressed.

