Torn between two lives

I am currently dating my ex-husband. We were married for seven years. We divorced basically because he became addicted to internet video games--as stupid as that sounds. We have two children together, now 15 and 13. We've been divorced for 12 years. I remarried and had two children. My second husband was a firefighter paramedic and suffered from extreme PTSD. He was very abusive over the last couple of years. I finally decided to leave that marriage in January of 2013. My first husband and I were high school sweethearts. We remained very good friends after our divorce commonly referring to each other as "besties". In October of 2013 we spoke for the first time about the possibility of getting back together. We both felt the same way that we are "meant to be". At this time he was JUST ending a relationship with a girlfriend of 8-9 months. We've been "dating" ever since. Well, he came to me two weeks ago and said that he thinks that he is torn between the life he had with her and the life he can have with me. I have the four kids, a full time job and all that comes with that. She has two children who are in college and an endless bank account from an sum of money she received when her ex-husband committed suicide. He said he misses the downtime he had when he was with her, the spontaneity of being able to "get up and go" at a moment's notice. I ask him if he loves her and he is adamant that he does not. BUT...I'm really not sure what to believe at this point. I'm sure this sounds ridiculous :) Any advice would be appreciated.