As everyone said, this is not your fault OP, I'm very sorry for what you've been through.

As someone who actually tried to commit suicide over a relationship (exbf cheated on me, and the girl pretended she was pregnant). One of the things I told him the last time I saw him, was that what Ive done was only on me, obviously the situation triggered what I did, but I never dared to blame him for what I tried and also made this very clear to my family. I know not everyone will take responsability for their actions, but I knew I had to.

So basically, don't let anybody blame you for her decisions, she triggered this whole situation, nobody forced her to cheat on you or commit suicide. That's all on her.