My boyfriend from 7 years doesnt want to get married.

I have been in a 7-year relationship with a man from a different nationality, we met and lived together for 4 years in Europe and then during COVID-19 he had to go back to his hometown in the US. Since then we have been in a long-distance relationship where I went to visit him in Florida and spent a month together. He wants me to move to America to stay with him but every time I bring up marriage he says he doesn't want to get married because he doesn't want to be married. With that said, it would be extremely necessary for us to legally officialise our relationship since I am not an American citizen and I would need to be able to live legally in that country, I have to mention that I never had that desire for achieving American citizenship or living there was never a dream for me, I am from south America and I moved to Europe by myself and I planned to settle there because I liked it there very much and the only reason I will move to the States is that I love him and want to have a life together and he simply cannot move back to Europe as he is in the US army. He told me he would keep me safe and if that means get married he would do it and that he would not let me go but he feels that I want to force him into something he is not ready yet. Last night I tried to speak with him and to get a clue of when and how we would do the ceremony because I am preparing to move to the States in a couple of months and I am worried about my immigrant status there, because I need to work to support myself, and he got upset with me saying that we still have issues in our relationship and that we need to solve that out before we even think of marriage. He says he loves me deeply and I honestly think he does love me, He says he is creating a future for us and the reason he joined the army was to have a stable security life to offer to a partner ( me) in the case. He has accused me of taking the proposal out of his hand and told me that "proposing" has been in his mind and plans but it should be something beautiful and special to do after my arrival and not over the phone, which I agree.