Found my Boyfriend's pipe and meth...

My boyfriend and I have hit a rough patch in our relationship. I'm 20 weeks pregnant and I went snooping because he hasn't been himself lately. I found a baggy of crystal meth and a glass pipe. He is asleep so I flushed it and went outside and stomped his pipe. Now I'm nervous because I know he is going to be mad when he wakes up and finds it gone. I wanna help him. I want us to be a family and raise our daughter together. I've been with him since I was 16. I know he is going to refuse help and say he isn't addicted but I believe he is. He has lost a bunch of weight and people have noticed. He is more violent and lashes out. I feel like if I leave him I'm gonna loose him. Maybe I already have and I'm just not willing to see it or accept it. But I know he is just going to keep hiding it and lying to me about it. I know what I should do which is leave but I'm torn between my head and my heart. I've read on the internet that if he was using when I got pregnant it wouldn't affect the baby. I definitely DO NOT use and the first time I've ever seen in it my life was today. I need some guidance and support please..