I empathize with you. I can't say I know the answer your looking for. There's too little info to hazard a guess. What I will comment on is only a hunch that I have about you. I could be totally offbase here, so don't take it to heart if I'm wrong.
I'm getting an impression about how important you regard yourself. You describe him as a busy person. Are you a busy person? How available are you for him ...others...? How is your self-esteem?
You've indicated that you're very considerate of his feelings (his energy) ... almost maternally so? Is it possible that you may have gone too far and put yourself in either the 'friend zone' or maybe put him off? Maybe you send him mixed signals?
Personally, I would wait awhile and see if he comes around. However, in his life who knows what other unrelated event might have occurred, either at work or in his personal life that could've taken his focus away?
Also, you may not know if he's seeing someone else or he has some troublesome relationship or whether or not he's a commitment-phobic guy. Too many questions that have no answer.
But, what you do know is you feel left out and need some answers to figure out if you invested well in this relationship. Until you get some feedback...perhaps you need to cultivate another friendship with someone else who is less distracted or acts more interested in seeing you?