Did I make the wrong decision to stay??

My husband and I’ve been married almost 11 years and throughout our marriage he’s been unfaithful many times. Not sure if he physically slept with someone but social media was his play ground. He loved Snapchat and sending photos back and forth with women. Anyways last year I finally said I was done and started looking for a place to rent and a job. He noticed I was really serious and started to change all the things I’ve been asking him to for years. He begged me to stay pretty much and I gave in but now it seems like he’s not doing everything he’s promised. I don’t think he’s talking to anyone or entertaining women but I keep regretting that I let him talk me into staying. My hearts not in this marriage anymore and I don’t know what to do. Even when I’m happy I’m really not. I put on a smile for our kids.