Good for you; take the steps you need to protect yourself and your son. It's easy to slip back into thinking about the past; did a bit of that myself today, but not too much. But in the end all we have is right now. And right now, she looks to be someone you probably don't want to be with. We have to keep telling ourselves to look at what is, not what was or what we hope might be. We can wait to see if they come around, but at some point we can't wait any longer. That will differ for each person, and only the person dealing with the situation knows when that moment has arrived.