hey-
that's a funny thing isnt it (well not really), but we can get blindsided at any time. we can feel so good about ourselves and so confident and then on call or text can casuse us to question things. if you have that fear about being sucked back in, maybe you can hold off on it. you dont owe him anything, so maybe you can just say you'll get back to him and then take a day or two to relax and think about it.
four months is a long time in some ways, but it is also just about the time we start feeling good about our life again.
i don;t know your whole story so i guess i really cant say much other than do what you feel is best, but take the time to find out what that really is.