Someone please help me

Two questions. Is it my fault? Should I tell their family?

My friend, 1, sent me a dm this morning saying, "I love you, I'm sorry I couldn't do it." I immediately went to our other friend, 2, who was just as panicked because she received the same message. And, 1 wasn't on the bus that morning.

We were trying to find all clues as to what happened, then we found two things in her bio, they werent matching with their boyfriend, and he wasn't in the bio which never happens. So we managed to contact him, and he told me that he broke up with them, because they came to to him saying that that they wished someone was there for them.

And apparently that made him upset because he thought that made their entire 8-month relationship was pointless. And I yelled at him though text, but gave up because he wasn't listening and it was pointless to gain anymore info about it.

I contacted them through every social media I had, I even commented on and old YouTube channel of theirs, and tried to look for them on the internet. I found some of their relatives on insta, but I'm unsure whether or not to contact them. I know nothing about their family so I don't know who to question.

I've been feeling guilty ever since then, because the last conversation we had was them helping me figure out if I was aroace or not. They've always been there for me, and I really do love them (platonically) but I don't know if it's my fault or not. I could've been there for them but I wasn't.

I feel like hurting myself because it's got me feeling so stressed and guilty. And I honestly thought to myself, "I'm never opening up to anyone again, I'm such an awful person."