Since most all of us were not the ones driving our divorces, the LBS if you will, then we have to recognize that we are on a different timeline than our former spouses. Most of our X's had affairs, decided they didn't want to be married, and we are where we are. They are WAY ahead of us on the timeline. Also, they weren't/aren't the ones hanging out on a forum like this.
So... it is a safe assumption to say that in general, they are all AHEAD of us on the timeline of "moving on" and they don't have the same thought processes that we do. So in general it is probably pretty safe to assume that they will be a) looking for relationships with more gusto since they are farther down the road, and b) will probably have more failed relationships because they haven't dealt with the things they need to deal with.
So, don't get jealous of the relationships you see them in. In general they are just killing time. The relationship will most likely end in failure and they aren't doing anything constructive/healthy. Also, don't read too much into little bouts of thinking they might be trying to reach out. Chances are it is because they are feeling alone and they are reaching out to something they know. IF, and this is a big IF, they are truly reaching out, then they will continue to do so and if it is meant to be then it will happen. DO NOT DRIVE IT.
Your mission ought to be continuing to find yourself and to recover the heart that you lost. It is out there, and it will come back when you least expect it and when it is ready. Do the healthy thing, don't mimick what you see them doing, don't play the game anymore.