Need advice for unmarried partner visa

Hello everyone!! I have a problem and I would like some advice from you! My boyfriend and I have been together for over two years, and we met at the beginning of 2022. We are both Romanian and met through a mutual circle of friends. He has been living in the UK for about seven years, studying and working at the same time. I am currently studying for my master’s degree in Romania and working here, but we would like to settle in the UK so that we are no longer in a long-distance relationship.

We want to apply for the Unmarried Partner Visa, and I wanted to ask which are the most effective pieces of evidence we should provide. I should mention that we see each other as often as possible. In the past, when I wasn’t working, I spent up to four months with him during the summer holidays. However, now that I have been working for four months, it has become much harder because I cannot take time off whenever I want.

What are the most plausible pieces of evidence that would help us obtain this visa? I can no longer bear the distance and want to build my life with him. Marriage would not be an issue, but in Romania, weddings tend to be expensive, and we would rather save money to settle in the UK together and pay for the visa. He has settled status.

We would like to know what evidence we should provide to increase our chances of a successful visa application. Thank you so much!!