From my own experience my parents are divorced and I only wanted to put my mum on my application as my dad would not be supporting me financially. So I had to upload a decree (divorce papers) and state why I did not wish to have my father on my application (in a cover letter) This was successful. As for your partner, as long as you’re not married, don’t put them on the application, because you’re not married, it wouldn’t matter anyway. Hope this helps. It’s what worked for me when I had this issue. (Add all evidence (decree & cover letter to ‘upload supporting evidence)