What should I do [i'm really very worried]?

There's a boy I've been talking for a month. he told me he loves me and the day before yesterday I told him that I am leaving Instagram and other social media just because I want to. he replied with don't leave me and some sad emotional kinds of stuff, I said I can't help, and then he told me that he'll kill himself and it's not the first time and he tried to kill himself earlier because of some big problems. I still temporarily disabled my account and now I've been worried about him, and today I went back to my account and saw he hasn't been active since the time we last talked.
What should I do [i'm really very worried]?
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