My boyfriend, who I've been with for two years isn't
always affectionate. I'm a pretty touchy-feely person, so at first this bugged me. But, it's just not how he is. He tells me he loves me, and I love him...and I believe that. Sometimes he gets in -very- affectionate moods where he's very huggy and cuddly, but most of the time he's comfortable with not being joined at the hip. In a lot of ways, he's helped me to stop being so clingy.
I think I was clingy in past relationships because I was heavier and I was terrified in some way that unless the person I was with was as fixated on me as I was on them, they would lose interest and leave me. After all, there were skinnier, prettier girls out there... But, being with Brian (and he's been with me through ALL my weight loss) has taught me that this isn't true. He's not clingy and I've learned that I don't have to be in order to keep him.
However, it sounds to me like the guy you're with is a little more than stand-offish and just not clingy...it sounds like there might be something else involved. If you're sure that you're where you need to be emotionally, and he's just not delivering in that way, then you might want to move on.
"Love" might be a word that's got all sorts of strings attached...but if you're in a relationship you're serious about, I think that the people involved shouldn't be afraid of saying it. Mind you, I don't think that being in love means perpetual butterflies in your stomach...I think that's more like infatuation or lust, I think being in love can be a comfortable, happy relationship. I think you should talk to your boyfriend about this...if he's worth taking the time to stay with, he should be receptive to your feelings about the issue.

Hang in there, hon...and don't stay with him if you're unhappy. If you know deep down you should get out, then do it. I stayed in my last relationship for a year after I knew I wanted out and all I did was waste my time/emotions and his time/emotions.