my boyfriend’s dad committed suicide and i feel like i caused it

i feel so…horrible. yesterday when i came home from work my boyfriend’s dad called him and he was so drunk and saying really horrible things to my boyfriend. so…i stood up for my bf and yelled at his father through the phone and basically said that he needs to call back when he’s sober and that he’s hurting his son. my boyfriend is autistic and very adhd so he was literally hitting his head against things he was so angry and frustrated with his dad. i just wanted his dad to leave him alone… he was so drunk he was rambling nonsense for like 10 minutes straight on the phone and saying horrible things to my bf (i got the middle and end of it on video). we tried texting him that we loved him and just wanted him to stop. he just kept rambling and at the end of the call he said “you’re dead to me” and hung up the phone.

about 10 minutes later we get a call from my bf’s grandma, his father’s mom, and it’s a policeman on the other end asking if my boyfriend wanted to hurt himself. he said no, they were just having a fight. then the officer says he’ll call us back later. didn’t tell us what was going on or anything. i thought i heard his dad in the background and i know i heard his grandma as she was handing the phone to the officer. we live across the country so this is all being done over the phone.

anyway, we don’t get a call until like two hours later and it’s my bf’s grandma. she said that his dad had passed. in those 10 minutes from when he hung up the phone on us, his dad apparently hit his mom and shoved her and went outside…came back inside saying he forgot his lighter…then she said she heard a pop from his room.

i can’t help feeling like this is all my fault. if i hadn’t said anything none of this would have happened. i feel so fucking awful and so so so fucking guilty. my boyfriend is devastated. and angry at his father. he’s not angry with me at all cuz he says i made him see how emotionally abusive his father was. but if i had just kept my thoughts to myself…

oh god. i don’t know what to do. what can i do? i wish i could go back in time. maybe his dad would still be alive.