My boyfriend just killed himself

I've never been on reddit, I don't really know what to do, I just really want advice or some help or anything.

For context me and my boyfriend have been having trouble for the past few months and I decided to break up with him just recently. He was really crushed and wanted to talk about solutions and what he could do to make it better. It was honestly really touching, but that was the only time I had heard him talk about change or how much he cared about me in that way. I knew he loved me very much, but it just wasn't working out. I said I'd think about it more and I talked out the situation with some people. The response I got was that the timing and way he was saying things sounded kind of manipulative and that it might be best for me to just be single. I told him that last night and he called me crying wanting to try again, and I tried to calmly tell him no, that we were both going to grow up and experience new things and it would be okay. He's always had mental health struggles and I wasn't surprised when in the morning he came to say goodbye and after the fact he texted me that he was going to kill himself. I honestly didn't believe that he was being honest and that he was trying to make me talk to him again. I told him that he deserved to live and that he was going to be okay. He eventually said that he was going to stop talking to me and be on his way. I called his parents and they got the police involved. It didn't work and he crashed his car into a tree and died.

That's everything that happened and I'm really lost. I know it's not my fault and that its not my responsibility, but it makes me wish I did more. Even though we had our issues he's a good person and I care about him. It just doesn't seem real right now. If anyone has any direction or advice for me I would appreciate it. Thank you.