Ask an Immigration Solicitor. Get an Answer ASAP.
I am not sure what your last message means. I am only here to answer your questions and nothing to do with the money side
Your relationship must be shown to be akin to a marriage and must be subsisting. There must be clear evidence of having maintained your relationship giving the distance. One occasion of spending 7 weeks together isn't sufficient to show a genuine relationship. Have you met his family? Apart from regular contact with social media what other efforts have been made to maintain your relationship? These are the questions the Home Office would consider. Once you can prove your relationship the next stage is whether you have the financial means to sponsor him to the UK. Clearly, you can. It would appear that you need to make regular visits to your partners home country or elsewhere.