So first question comes to mind, can you tell me what you love about him and what is good about him? I'm not being sarcastic here but honestly asking you to ask yourself that, because it sounds like a very cold relationship to me, at least from your description which is not good.

Second question that I wonder is, you're saying that he gives you nothing in return but the question is, has he ever actually been these things, and was there a point where he was actualy a romantic, giving person? I ask in all seriousness because if he was at one point and it changed, it says one thing and if he never has been, then it says an entirely different thing. Something would cause one to become cold and distant, whether it be mutual, something you did or something that happened to him entirely on his end. That's what I would wonder if it's changed

On the other hand, some people are naturally reserved, i.e., do not show public affection, are not as touchy and verbal. That is not an excuse but just that sometimes early in a relationship there are things that are present that we overlook in the early periods, even years of a relationship that later are things that become problems. We as people tend to do this in the blindness that comes with love sometimes and we make huge provisions for things that should not be acceptable in the first place and especially not for someone we consider long term. I add this because it's my thinking behind whether he's changed or always been this way.

That would be my first thoughts on this, i knwo it's not advice per se at this point but something that I wonder about this relationship.

I'm not condoning his behavior or neglect at all.