I wonder how often and in what way you have raised your concerns to your boyfriend. I know you don't want to pressure him, and anyway, why should you need to? That simply puts you in an undignified position, and I can tell by the way you describe the situation that that is simply not your style.
The harsh reality might be: he is still looking for "the right one", or he is afraid of losing his independence, or he is seeing someone else.
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It is not uncommon to find ourselves in a relationship which seems to have so much potential- if only he would just commit. It seems to happen to most people at some time or other - sometimes more than once. Then along come the following questions: Is he ever going to commit? Am I just wasting my time? What if he comes around just as I move on? What if this is my only real chance of love?