Falling out and stuck

I've been with this guy since we were in college, we're actually on our 6th year. We have a normal relationship, we go out, have dates, movies, swimming, cuddles etc. etc. I can't even point out anything from our relationship that went wrong, he is so loyal, faithful, loving, he gives his best in our relationship and in everything, as well as i am to him. My friends are even jealous of us, of me having a man like him, while they were all having problems such as girls hitting up with their boyfriends, and everything similar. But it's been 6months of me fighting this feeling that I guess I'm falling out. Well, I am not pretty sure if that's I should call it. All I know is, I don't have the drive to be with him, I don't want to talk to him for a long time, I just feel nothing and the saddest part is before I left overseas we kissed and it just felt so blank, no chills, didn't felt happy, nothing special at all, and that really made me think in deep thoughts that I really think I'm falling out. Though I really love this guy, I wouldn't even fight my feelings, or stayed with him for 6 years if I didn't. I can even see myself getting married with him (though we were young then.) Now I think that is the problem, we were just 16 then, we were so deeply in love with each other, all we'd ever think and do is encourage ourselves to finish college and be professionals. But now it's a different thing, for me, I'd want to do a lot of stuffs, i want to enjoy my profession, travel, do further studies, meet new people, in short I want to get out of my shell. Explore things, that I know I can't do if I'm with him because I know one way or another, there will be instances that he won't let me do or be in it. There are no other reasons for me being like this to him, I've never cheated on him and will never do, so no other guy involved. So probably it's falling out, and just wanted to be a free career woman. Now, how can I ever tell him this. It's just so hard for me to say things right when I know everything's wrong, but he's still there hanging. I don't really want to hurt him, but there's no other way. I know some of you may think I'm rude, but I really never wanted to feel this way. I don't really know how to deal with this. Responses are all welcome. That would be it. Thank you.

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