I think when we say always available, we mean to her. You might not physically be available due to work as you have just stated, but you do seem to be just a text away from her. Also, we can only go off what you have stated. I personally think that she knows that you will come to her whenever she ask because you say that. I have not read at all you telling her that you can't come or such, and I totally get it. I bend almost everytime also.
What I do think is going to happen, I almost posted this the other day. I do think you will tire of this. After all, you want a wife/partner to be with. Not a "friend" you hang out with across town that text sweet nothing at night bc she is lonely. When we are suggesting the pulling back, or at least me, I'm saying it to help you. To get this woman to see what she will be missing. As of now, you are a constant in her life.