From what you've said, your b/f now will be your husband or maybe fiance then. HE will be your sponsor and it is he that will need to provide all the financial and other evidence, not you. So he will need to provide 6 months bank statements etc.
(do not show any overdrawn banks statements)
The work status of your b/f fiance husband will not present any problems at all provided he can still clearly show that he has sufficient disposable income to allow the support of an additional adult consumer in his accommodation.
Hope that helps