<human>: Can you provide a brief overview of the text?

I will call the girl Jess and the guy Dave.

 They have been dating for just over a year and a half and I was good friends with both of them before that. Before the they started dating I had a mutual romantic interest with Jess but we never did anything about it. Dave knows this but has never really mentioned it before.

 We all recently started college (2nd week) and Dave isn't coping well. He has become emotionally controlling and started blaming Jess for everything that happens. Due to all of the new people, he has become paranoid and overly protective of Jess and won't stop his behaviour even when she asks him to.

 She has told me about this and started becoming very stressed out about it. To make it clear Dave isn't a bad person, he just seems to be a bad boyfriend. I'm worried that anything I do could cause problems between themselves or with me and Dave/Jess.

What should I do in this situation?
<bot>: My best friends are in a bad relationship with each other and I don't know how to help either one without ruining my friendship with the other.