Can't fight no more?

I am getting people around where I live at saying my boyfriend and the father of my child is on crank. They said they have done it with this and I see signs of it myself (like the oily face, dog breath, not interested in and staying up all night while the next day clean up da whole house and getting pissy out of da blue). Of course he denies it and has been lying to me a lot about little sh*t (like where he's going ). I broke it off after 3 years and now I don't know if I want our daughter to see him. His sister just tells me to leave him alone he's grown (31ys) but we just lost a friend that died to an overdose 6 mos ago and I don't know what to do anymore, If he's lying about it then that shows me he dont want help. So wha move can I make with all this going on. Should I ignore what people say? Should I take our daughter?