AITA for breaking up with my suicidal boyfriend and telling him to off himself

now hear me out. I had a friend whos name is Dari (nickname) anyway, we were friends for a pretty long while and he was just pretty chill idk. We texted for like a year before he asked me out, he was really sweet, used to compliment me and be rlly enthusiastic abt what i did, so ofc i said yes. Fast foward to one year in our realtionship, everything was well, he was still the sweet guy he always has been. But after a while he started just getting rlly depressed and talking abt how numb he feels and how worthless life is, im apathetic so i couldnt rlly empathize with him much, yet im not a monster so i still tried my best to comfort him and be there for him. Eventually i just comforted him, gave him some tips and just let him be so he has some time alone to figure things out and (hopefully) get better. But gosh was i TERRIBLY wrong, from there on, things started getting HORRIBLE. He started venting and saying depressive shit in EVERY text. Like as example, two weeks after i got a puppy i yapped about for rlly long that i wanted, i texted him „Hii, forgot to tell you, i actually got the puppy!“ and he replied with „hi, forgot to tell you, im buying pills“ and i think yall know what that implies, later he sent me a photo of a pill bottle, idk what kind of pills they were but yeah. And it wasnt the first time, he once also sent me a pic of a kitchen knife, and once one of him sitting on the edge of a roof, both with the text „im doing it tonight“. One day i couldnt handle it anymore since all he talked about was committing even tho he never even tried to even give himself a scratch, so i brole up with him. After the Breakupbhe started bombing me with messages telling me i should not leave him or he will kill himself and saying im a monster for playing with his feelings even tho i know he stuggles, so i told him to stop being a coward and actually kill himself, after that i blocked him. now i havent been in contact with him for the last 5 months (i think), i know he is fine as i still have him on snapchat and he regulary does some snaps, his last was two days ago, actually. I have my own struggles and mental issues, and it was rlly hard dealing with his constant venting and sh threats. By now i dont even give a shit abt him and wouldnt even care if he would actually go trough with it cuz at this point im just disgusted by how ignorant he was, always making it abt himself and that even when he knew that i struggled just as much. So, am i the asshole?