Good advice so far. It sounds like he's trying to sabotage her leaving for college. Tell her nothing should stand in the way of her education and this is an unhealthy dysfunctional relationship. If he keeps threatening suicide, tell her to call 911 because he needs a professional and she should also tell his parents. He may indeed be serious OR he could be manipulating her. Tell her you love her and don't want to see history repeat itself - meaning if she saw her dad emotionally abuse she could be more likely to tolerate it with her own partner. This can be the greatest time in her life as long as he doesn't stand in her way.