I am happy for you that you have met someone that brings so much excitement and joy to your life. While long distance relationships can work the insecurities you describe seem to be growing. Maybe because of this you can use some reflective distance to gain perspective. It sounds as if this relationship exists virtually and that you haven’t been in each others physical presence. If you have been chatting for six months and feel a deep connection this is wonderful — but long distance relationships often serve a purpose in that the distance itself is part of the formula for what makes it work. The longing — wanting but not having — becomes part of the dynamic. There are several reasons for why this can happen, but it isn’t an uncommon occurrence.
What you are feeling is the potential of the relationship — the promise — not the reality. The reality is you feel good but you’ve never met him; absorbed in love and insecure; excited and worried. The hope is that the relationship can live up to the potential.
Don’t jump too far ahead of yourself. While it is wonderful to be in love there are many surveys that show the first part of a relationship can inflate our view and expectations. Give this both time and perspective. Meet him, spend some time in his world, and have him spend some time in yours. Until you interact with each other in person you are projecting a future based on too little information.
If he can’t seem to make time for you because of his work, what will it be like when you are actually in his world? Stay hopeful, but give yourself a chance to look past the potential to the reality of what is. Take each phase of this relationship with equal doses of love, hope — and a clear-headed reality.