Why do some people recycle old relationships?  Is it that they feel more comfortable with what they know? Are they afraid to move forward? Is it low self-esteem or fear of rejection?

And when they recycle, are they going back to that old unresolved issue, which is the reason they are not together, or is it that these issues were resolved and the timing is now right?

I have known people who have gone back to an old partner out of loneliness, just to find out that the thing that tore them apart is still there and unresolved, thus resulting the relationship ending badly for a second time.