Still Crazy After All These Years

The last few weeks I've been haunted by an ex-boyfriend and for some reason I've been allowing this to happen. Why is it that we allow for certain people to come back into our lives? I mean he is definately someone who has come "crawling out of the woodwork," for me as of late. So, of course, like all people and especially girls, I tend to read too much into this. I know nothing may never even happen between us again, but the fact that he has come back which makes me wonder. So why is that people take so long to move on? Is it "undying" love/interest or just a series of weird circumstances? I just find it weird that they're some people in this world who just can't stay away from each other, despite how bad things had been. But thatt's just my opinion I could be wrong...