Should I be worried?

So about a week ago, my friend tried to commit suicide.. she told me about it during lunch and I told her she shouldn’t do it and that I would send someone over to her house. She said okay so I didn’t think she was gonna do it.

I called her at 8pm that night ( 10 times ) I started to freak out I called one of my friends who had a car and begged him to go over there and he said he couldn’t that it was his moms rules. I eventually call her sister and she tells me my friend did try.. she took 20 sleeping pills. I honestly blame myself for it. My mom told me I should feel bad and it hurts.

I was talking to my friends ex the other day and then he tells me this..

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He ended up threatening me and I act like it doesn’t bother me but that night I had a dream he tried to kill me.. should I be worried about what he’ll do?