Fiance has baby with me and fathered another with another woman

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I have a baby with my boyfriend of 6 years and just discovered he has child with another woman.my baby's only 6 months older than this other child. i have left him but he doesn't want to accept that it's over.the other' mother' is crazy she threatens to kill me, him and my baby.i have moved, changed my phone number and had a restraining order against her,she still doesn't wanna quit.she's a nut case as she has been admitted to a mental hospital twice.she's angry because she believes i'm still goin out with the looser,they broke up and she poured boiling water on his face...should i be scared or are these just threats?