How can i address my bfs emotional abuse?

If you don't know: How to approach this recommend seeking input from a therapist who works with domestic violence.

Communication: Simple, direct communication is the best way. If that doesn't work perhaps the real question here as far as counseling goes, is why do you continue to stay with him? It's a tough thing to look at, I realize, but perhaps it is you need to counseling, and not him.