Even as a sub, for me, I hate that weak feeling as well. It is something that has taken me a long time to deal with and still am. Although, often times what we deam as a weakness, really is not, it is simple human emotion. But we are always so hard on ourselves.
If you want him happy and you love him, trust him when he tells you he wants you. Your leaving him because of your own self doubts ( and yes, distrust) would certainly make him unhappy.
Now, if you do love him and want to serve him, realize it takes time to develop those bonds of trust, communication, and willing servitude. It does not happen over night. It can takes YEARS of training and learning.
Are you scared of falling in love with him? Is this not a plausible situation?
The wonderful thing about this board, is that its a safe place to talk. In my own personal opinion, no Dom should be upset if his sub. needs to air her feelings or discuss their concerns, as long as she does so in a way that is respectful. I am hoping that you will be allowed to freely discuss your feelings.
Perhaps, being a sub. is just overload. It is not easy. Did you step into the waters slowly? Or try to jump right in? Perhaps you may need to take a few steps back and breathe and start over. Learn together. Learn to trust and communicate.
I do not know what happens in your relationship with you Sir, but, remember that it is not all about the physical pleasures. He is there to mentally and emotionally support you and take care of you. YOU NEED THESE THINGS.
In my opinion the physical cannot take place without these things. Especially as a woman, we often times need the mental and emotional support and stimulation even more than the physcial.
Please, do not hesitate to contact me.