Upvote:6
The rejection letter indicates that the visa officer has no problem with your financial status. The rejection was not for that reason.
Instead the officer does not consider you have provided enough evidence that you actually do intend to marry the person you indicate, or that the marriage will be a genuine one (meaning one not conducted purely for the purposes of immigrating). Note that even if he believed you would return to Germany after your visit, he would be obliged to refuse your visa if he believed you either were not going to marry, or were entering into a sham marriage.
The specifics mentioned are:
To answer your actual question, a tourist visa will not allow you to get married. A wedding official will need to see your marriage visa before they will marry you. If you wish to abandon your plans to marry your fiance in Britain, and instead merely visit her, it's hard to say if that will be successful. In your favour is your track record of visits and the stability of your situation, together with the fact that the genuineness of your relationship is not a factor in a visitor visa. Against you is a visa rejection. My guess is that you would be granted one, but it's just a guess.