It is not something I have heard before & I have a general idea, but am not SURE what it means.
What are you supposed to say, when a guy says that?
Is he offended if you don't respond?
Is a guy saying attached, different than being attached ?
Like: ' I'm crazy about you ' ,is different than being CRAZY.
Most Helpful Guy
A man is saying he thinks a lot about you during the day when you are not there, fantasizes about you during the night and is curious about you as a person. Its not necessarily that he loves you but more that he feels the need to be around you. Its a way of saying he is willing to open up his mind and one day his heart to you if he continues to do the above. At least that's when a man's man (mature) tells you so.
When a boy-man (immature) tells you that its saying he cares about you but is unsure about his feelings for you romantically.
Up to you to know whether the man saying so is a boy-man or a man's man though to be sure.