My boyfriend is suicidal, what do I do?

I was telling him that for religious reasons, we may have to be friends for a little bit but we both agreed that when the time is right we'll pursue a relationship again. We got off of a call together and he said that he felt like sometimes negative thoughts get in his head. He started crying, saying why am I even here AND why do bad things keep on happening to me. He said everything is his fault and he always messes things up. Note that he has tried to kill himself before in the past.

All I did was assure him that this is not the case but I also was extremely concerned because it is necessary that we take a break and become friends for some time due to my reasons mentioned above. What do I do?

I wouldn't forgive myself if anything happened to him