These two need therapist, and they need to communicate with each out. It wasn't her place to try and break up his only friendship, and she shouldn't be demanding he communicates what caused him trauma in middle school. She has no sympathy towards him, and even though she's doing all of this and being demanding about his past, she not even in slightest prepared to invite him into hers. He's is closed off to everyone except his bestfriend and he depends only on him, I can understand how she would be jealous. He probably doesn't want to share his truma with her because it might emasculate him, and he doesn't want to be seen in that light by her. He needs to communicate this. And she needs to figure out how she can meet him halfway.