Fitchicky-I would say almost 100% he is def using again.
I myself just started to coming to this forum, as my ex is a crack addict. He just started using again after being in prison for 4 years, saying he was in a drug program the last 2 years of the 4 year sentence. I now question if that was ever even true. He got out Friday Oct. 26th and got home on Saturday the 27th. I went to see him and immediately basically we were back together. Saw him again on Sunday the 28th and he was using again by Monday the 29th. I have heard nothing from him since that Sunday night when he called me when I was on my way home.
I got a call from his sister on that Monday night that he was running around in the woods in their neighborhood high, acting like a crazy person and that people were talking about calling the cops on him. She told me "He is not the man for you. He is not going to do right like he said he would. You deserve better than this. You need to move on to someone who can love you like you deserve. You've loved him and been there for him as much as you can", etc etc. She's right. It hurts, but I know it and I knew it before I even saw him again.
We have a long history. He is my first love that I met when I was 16. I'm now 45. We lost contact years ago and reconnected Jan 1st of 2013 and have been on and off since. I have been on this merry-go-round with him and I'm finally off of it for good now. However, it is still fresh and hurts very much.
I say all of this to say, that while I was never married to him and do not have children with him (or any children at all for that matter), I can't relate to that and will not try to act like I can. What I can relate to is being with an addict.
I would suggest looking up the term 'gaslighting'. My ex would do that to me when he was ready to get back out there. It's basically where they play mind games with you and try to get you to feel like you're crazy and question your own sanity, etc. It's cruel and it's common for addicts to do. At least that's what I'm finding out.
I would suggest getting off the merry-go-round also. I know that's way easier said than done. Do it for yourself and your children. I wish I had more detailed advice as far as exactly how to do it. But I don't have children, so I am unfamiliar with the resources available. I know you will find great guidance here from others on that piece of it. I just wanted you to know you're not alone, you're NOT crazy and I believe he is using again and you have to look out for yourself now. My heart goes out to you and your children. I'm so sorry you're going through this.