Boyfriend tried to kill himself in front of me again

it's so bad I woke up to the sound of breaking glass and found him in the bathroom slashing his wrist with a piece of glass the cut was so bad I called emergency services because it was bleeding so bad and life threatening. He started writing on the walls in his blood. When he left I didn't follow him in case it was unsafe. He has been making attempts so often lately. The Police and paramedics that came were so insensitive and irrelevant questioning. They found him somewhere after he ran away and took him to hospital. I just woke up to a missed call and 5 or 6 graphic photos of his cuts and him calling me evil. This is the second time I've had to watch him slash his wrists last time he used a knife. I think we need to break up I almost hope that he wants to do that when he gets out because I don't want to make him worse by abandoning this relationship right now. I don't know what to do.