UK visa and invitation letter issues

First, there is no visa to visit relatives and friends in the UK. There is only a General Visitor visa, which is a tourist visa.

Second, if you want to go to the UK to see your boyfriend, this is the reason, not the purpose. According to UKBA's logic, you can't come all the way to the UK just to "see" your boyfriend and do nothing else. Unless you can prove that your boyfriend is disabled and can only stay at home or have someone to serve him. This is a simple logical question.

Third, your boyfriend has no legal relationship with you. As a foreigner, his private invitation letter has no meaning and will only complicate things. If he says he is willing to bear your expenses during the trip and provide accommodation, this is not called an invitation letter, but a sponsorship letter. But because he has no legal relationship with you, the result of his doing this may easily lead to your rejection of the visa. UKBA believes that if a tourist does not even have basic economic conditions, then traveling abroad is very doubtful and the tendency to immigrate is too high. In addition, UKBA has never asked for an invitation letter.

Fourth, you must understand that it is you who is applying for a tourist visa, not your boyfriend. No matter what your boyfriend’s status is, it has nothing to do with you. You are an independent individual, and UKBA pays more attention to the applicant's own conditions.

So, my suggestion is that you apply for a tourist visa yourself as a tourist and do not have anything to do with your boyfriend.