It may be because he has had a profound effect on you to the point where you simply can’t help but think about him throughout your day.
He may have told you something that stayed with you.
He may have treated you in a way that you aren’t used to and left you curious and wanting more.
He may be mysterious and hard to read.
This kind of guy can sometimes be hard to forget.
He is a different experience from what you are used to.
He gives you something that you tend to respond to.
That something could be mystery, intrigue, danger, perplexity, etc.
There is an effect this guy has on you that draws out a particular emotion.
You like this emotion. This emotion is what keeps you interested.
Perhaps you have found it rare to experience this particular kind of emotion with anyone else.
This guy becomes a fixture in your imagination because every time you think of him, this emotion surfaces.
Since this is a powerful emotion that you rarely feel, you want more of it.
It’s almost like a drug that you can’t get enough of. As a result, you start thinking about this guy even more. He becomes impossible to forget.
You are essentially attached to that emotion and the person that elicits it from you.
This may be the type of guy that you consider to be your ideal.
Perhaps your ideal has eluded you in life.
This guy finally meets that bar. However, you may not be entirely certain why he does.
Other guys that have liked you in the past may have seemingly had the right qualities.
On paper, these guys were picture perfect for you. However, you always felt that there was something missing with these guys.
You may not have been able to deduce what it was but you felt it.
Notwithstanding, you went along and dated some of these guys because they were decent enough.
Perhaps you even told yourself that what you were seeking would be impossible to find.
That feeling that you want to experience may not be at all realistic.
You convince yourself of this and proceed with your dating life.
Each new guy you date is basically the carbon copy of the previous guy. Again, on paper, these guys would seem to be your perfect match.
However, in the back of your mind, you still know that there is something missing.
In walks this new guy.
He gives you that emotion that you have been so craving.
He makes you think about him at all hours of the day.
You are feeling good. You probably even have butterflies when you think about him.
This guy is giving you the emotion that you have not been able to get from other guys.
It could be the way he talks or carries himself.
It could be the fact that he isn’t an open book and you know so little about him.
It could be that he doesn’t pay you much attention.
It could be the way he touches you and his tone of voice.
It could be that he tends to know just what right buttons to push to get you to laugh or even be mortified about something.
He is different.
This is why you can’t forget about this guy.