I have moved out of my mom's house 3 times since I've been 18 and each and every time she has…

I have moved out of my mom's house 3 times since I've been 18 and each and every time she has slipped into a deep depression and talked about suicide. well last night I overheard my cousin talking about selling crack out of my mom's house and when I told her all she said was " ima talk to him " now I'm pissed off like what if the cops just in here and my son is here or what if someone comes in here trying to kill him and god forbid my son gets hurt. I have started looking at places today but is how to tell her I have plans on being out of her house by the 1st