Christian husband drinking

As a conservative Christian, I believe that drinking alcohol isn’t good. And I don’t judge if someone drinks a glass of wine or beer here or there while eating a good steak or something. But if you go hang out with unchristian friends and then get drunk and come home with a hangover. That just not ok. My husband doesn’t do this often, but he knows that it breaks my heart when he does get drunk. Yesterday again I was waiting for him and he never came, he slept over at his sisters house because him and his friends were over there getting drunk. I’m so hurt by this. He went to rehab for drugs and alcohol before we were married so you can understand why this bothers me so much. When we started dating he told me that he is done with all that and acted like a good Christian guy. I believe people can change, so I gave him a chance. Now I’m scared that he might start with his old ways again and we can a baby boy together and I just can’t have him growing up thinking that his dad is a drunk ( if things get worse) or just thinking that it’s ok as a Christian to do these things. I know to some people it might not be a big deal, but it is to me and I just don’t want him to escalate and end up doing drugs or cheating or who knows what. I’m scared about the cheating because his dad left the family when my husband was a kid because of cheating. I don’t believe in divorce unless there is abuse or cheating, but I also don’t want this for my baby boy or for me. Any encouraging words or advice would be appreciated?