Is this cheating? Would you divorce over this?

Husband has a drinking problem. Maybe once every few weeks he will come home stumbling. No physical abuse, but often he yells at me for nothing and then stumbled up the stairs, falls asleep, and cries and apologized the next day. Been this way for years. Every time I believe him when he says it’ll be the last. Stupid I know. We have a 4yo, 2yo, and 9 month old.

So last night he did it again. He stumbles upstairs and crashes out after yelling at me for about 15 seconds. I have never, in the 5 years of our marriage, looked on his phone. Never. I trust him completely and always have. But something in me last night told me to check. I just had kind of had enough. So I did.

I found a girl on Snapchat that he used to hook up with right before he met me. She has sexy pictures and videos on there saved from the couple of months before we became official. Ok, so they were before me, so it’s ok. Of course it hurts to see but he wasn’t unfaithful right. But it shows that back in June, 2 months after I gave birth, he had sent her a couple of pictures of him trying to look cute, like one of him looking good and another video of him just looking at the camera obviously trying to be hot or whatever. This was back in June. I don’t see anything else until it looks like he sent something a couple of days ago. I don’t see any saved replies or anything from her.

I confront him about it the next morning (this morning), and he said that back in June he was drunk and added her and sent those pics. He said when he woke up the next day he realized it was wrong and deleted her immediately. Fast forward a couple of days ago, he said the reason he added her again was because we got in a fight and he just did it because he was mad. He said he was going to delete her again but bad just forgotten. He said he never sent her anything this time around.

Am I being dramatic? But I’m done. I’m so hurt and feel betrayed, also with the god damn drinking, but what hurts more is this chick. I mean I think we all know what his intentions were, to talk or flirt or get pics or whatever. She’s out of state so they couldn’t meet up. But I feel like I’ve been cheated on and he keeps saying that’s not cheating. I can’t get her pictures and sexy videos saved on there out of my mind and don’t think I ever can. She’s 100 times better than me.

I’m getting ready to divorce him because I’m truly hurt and mortified. I am in shock. I would have put my life on it that he would have never done something like this.