Am I Wrong To Be Upset ?

So about a week ago I found a hotel key paper ( the kind you slid the key in and it has a room number on it) in my husband car. I later asked him about it and he go so upset telling me I’m making shit up and he didn’t do anything …he got mad at me and didn’t talk to me for 2 days until I apologize. but I got suspicious. So later I decided to get into his phone( which I’m never allowed to touch.) and I found a bunch him talking with other girls on Snapchat and sending girls money, and telling girls they are beautiful. I was crushed. We’ve been together 11 years and have 4( plus one on the way) kids I confronted him about it and he told me I needed to calm down that he can explain that he was trying to “scam “ money from them and they were robots or some sh!t ( I was so upset I really couldn’t understand what he was saying) we fought for hrs over this and I was at the point of leaving and he begged me to stay. And said he would change and it would never happen again. I love him so much but I was told once a cheater always a cheater and in my mind he cheated. Am I wrong? Or am I being upset for no reason.