Welcome to the forums, ConfusedGurl.

There are so many factors that enter into this. Some religions do not allow much physicality before marriage, and you haven't said whether this is true for both of you. That might explain some of the slow development.

Are you working together? That also presents ramifications.

Is, he, perhaps married or otherwise occupied in another, more sexual relationship? Would he be able to keep that a secret from you for so long? Possibly. We trust those we care about, so we are often more surprised by a deception than disinterested parties observing from the outside of the relationship.

Is it possible that he is in denial about gayness? This, too, can stem from cultural factors. Religion. Family. Our cultural prejudices. The prejudices of small-town life.

It seems like it might be time to move on. Perhaps the very act of moving on will motivate your BF to examine his feelings and decide that he doesn't want to live without you.