Most cuckold relationships go unbeknowist to the husband/BF ... its just the name tagged to a man who's wife has sex with other men, whether he knows or doesn't know, and whether she continues having sex with him along with her lovers or not. Women now fuck around on their husbands every bit as much as men have always fucked around on them. However, I don't think most men could tolerate, for very long, a sexless marriage/relationship. He might like it or tolerate it for a while, but in the long run it would usually get old.
My concerns here (back to your original question) are the facts that she's opening using you financially, AND, that you are not getting out of the relationship what you want or expect. You desire an affectionate relationship, and that's not what she's offering you. This can only end up working out badly for you ... possibly resulting in you depleting valuable, personal, savings just to be around her. Its a relationship built on agreement and convenience, not affection.
Maybe a few other forum members can offer you a few good suggestion. Good luck and welcome to BtoW. Mac