He will always be an addict, and that is a reality your daughter will experience for the rest of her life. He may a recovering addict who works with other addicts and who grows spiritually and emotionally through long-term counseling and who collects sobriety chips year after year and holds his head high. Or he may be an active opiate addict who cannot keep a promise and cannot connect emotionally and cannot be trusted regarding money and property. One of those two will be your daughter's father, as addiction is a permanent condition.
So, as much as your heart longs to control your little child's family life and her relationship with your husband, the fact of his addiction has permanently changed everything. And now it is best to face it and to do whatever brings stability and security to you and to your daughter.
If you attend Al-Anon or seek counseling or both, you will find your answers. If you try, instead, to handle this without outside help, you will be driving in a thick fog and will make serious wrong turns which could have been avoided. I hope you will seek the professional help you need for this crisis in your life. It can make all the difference for you and your children, most certainly. And it might make a difference for the addict, but that part is by no means certain.
All the best to you as you face many hard choices. You will find the strength. You will be amazed at what you can handle. Just don't isolate, for that will weaken you.
There is hope. But as is often said in Al-Anon, recovery for the addict almost always starts first with recovery in the family. So really this is about your recovery right now. And what steps you choose to take to initiate that.