Cannot Get Old Boyfriend Out of My Head--What could it mean?

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I have a problem that is really starting to bother me. Lately, I cannot get an old boyfriend out of my head. I think about him, alot! I think about how he looked, how he dressed, what made him laugh. I can actually hear him in my head, the sound of his laughter and when he would say my name. I can even remember the smell of his cologne. I haven't seen this boy, well he is a man now, in 20 years. All of a sudden he is in my every thought. I am a married woman. I haven't thought about any of my old boyfriends like this before. All of a sudden I am thinking of this one guy like I did when we were dating all those years ago. My sister says that it could be an indicator that I am unhappy in my marriage and that my mind is taking me back to a happier time. If that is the case, why didn't it just take me back to when I was happy in my marriage. I will admit that my marriage is having problems, but who doesn't have problems once in a while? I am just really confused by the fact that I am thinking about this guy so much that I have started dreaming about him. Any ideas on what it could mean?