This Is A Relationship Problem That I REALLY NEED HELP!!!!!!!

I have this friend whom I have known for nearly two years and as time pasted we grew closer, as I started to help him get over his past and helping him learn to control his anger and even be his shoulder to cry on.I helped him and showed him love in a way no one else could or would. Over time he began seeing me as more than a friend and fell hard for me, he tested me and told me his feelings which I was stunned by but also happy. I told him I'd love to go out with him but I just didn't feel the same way and I can only hope they never did. He was disappointed but went along with it. And over a month or two one night I just said "Yes, I'll go out with you." Why? Because he sweet talked me that night (he did it before that too though) and my heart was swept away by him. Ok so I went out with him but every time he touched me I didn't feel that tingle when you touch some you like let alone heat, when talks to me I don't stop and stare in his eyes, my heart does pound at 100 miles an hour. I just don't get ANY of those feelings I did when I had my first and second crush. My heart isn't in it with him, yet I tell him I love you and I act like the perfect girl friend when we make out and talk, he feels like he is heaven (and I KNOW he does because I see it on his face and I HEAR it in his voice) but me? Nothing. None of that happens to me. I want to love him but I just can't for some reason! AND I DON'T KNOW WHY?!?!?!!!! We have been dating for a good eight months now and NOTHING has changed!!! I get the feeling we are not to be no matter how much I want to spend the rest of my life with him. I just don't feel anything....I told him and he said they'd come but they haven't.