Not sure if we should try again?

Nearly two years ago I left my husband for being abusive. He was sick (depression and anxiety) and took longer than he should have to get help. It was only when I said I was done and wanted to leave, after years of trying to get him to go to the doctor, that he decided to go, and even then called and harassed me/threatened. Two years later, he has slept with another woman and had the bachelor life, since I have our son with me, but says he wants us back. He lives in the UK and I moved back to the US. My son is fairly young so it didn't effect him moving so far away, and he gets to see his father a few times a year (on average, 3 - i have sole custody.) He says he has changed, and has never stopped trying to get us back together, but it would have to be over there which I am not sure if I am comfortable with seeing as though I have no support what-so-ever and am completely dependent on him as the house etc. is in his name. He guilts me saying he feels bad for our son and how he will be missing out and how we could have made things work etc. etc. I have said I want a divorce multiple times and he has agreed then always pulls back and says things like he wishes I would think about it etc. and pushes the divorce back more and more. Sometimes we argue and he can be cruel, or sometimes he can be nice - but I wonder if its just to get us back. I remember the good times, but I also remember the bad - and they were horrific. I know people are capable of change, but I don't know if he has changed, and I am not comfortable putting myself out there to find out. I got out once, who knows if I'd be so lucky again. But I still feel guilty for our son and am not sure if I am making a mistake or not, if he has actually changed. He said he would move here but it would have to be after he knows we could work it out etc. but in the past said he would move to the US and never did - what he says and does are usually different. But I also know I can't live in the past. Its just a big risk, in my opinion. I don't want my son to miss out on his father and mother together or have him brought up in an unhealthy environment if us together became a war-zone and feel like I can't get out again. I'm a good mom to my son and he is a very happy boy. I just don't want him to miss out. Am I doing the right thing by wanting a divorce? Sometimes I miss the good times, and I feel sad and wish we could start over, but trying again wouldn't be a fresh start. And even with marriage counselling I feel as if too much has happened, been apart too long and we have changed from who we once were. I don't know what to do. And if I am doing the right thing by wanting the divorce, why do I feel so guilty?

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