My bf wants to kill himself :(

Erika • puppy mom
 He will mention how he would just be better off dead and it hurts me to hear him say that and know he feels that way. I've felt that way before and I got help with therapy and a Dr. I've tried asking him to go to therapy and see a Dr, but he refuses. We always have a wonderful time together, but when he leaves I'm always afraid it's the last time I'll see him. 
He thinks he's a terrible bf and ugly and all these things that I've never said to him ever! And when I reassure him he thinks I'm just saying those things to make him feel better. I love him so much I just wish he'd realize that and stick around 😣
Any advice would be greatly appreciated.