My ex-husband was an alcoholic. He used to say all kinds of things to get me to stay with him. He used everything from "I can't live without you...I love you" to "You'll never see the kids again if you leave me". In the end, it was all about control. He wanted to maintain control over me and my life. He would go through large, dramatic demonstrations and, even if his behavior changed, it was only temporary. Within a month or so, it was right back to the same old same old.
I hope that all goes well for you. Do not second guess yourself.