So Lost

Just found out my SO has been doing hard drugs for the past couple of weeks/months not to sure about the time frame. We just got back together like 2 months ago so I say he's been doing them about a month. We have a child together and I tried so hard to make it work. He asked me to help him threw it but I just don't think I can. This too along with his many other short comings I forgave him for and tried to start over! He kept the bills paid me and baby never wanted for anything and yet I feel violated. He lied to me AGAIN! Idk what to do. He's never cheated he just has a lot of fucking issues and in tired of trying to fix him. I can't talk to anyone about this please give me some insight. He's been popping pills, doing coke, and heroin he said whatever he can get his hands on.