I can't do it. Many years ago I had a couple of these from women I met in chat forums. But they ultimately turned out to be nowhere near who they claimed to be. In both cases they disappeared one day without warning and it took a lot out of me. Especially one of them who every time I expressed doubt, she would react as if I hurt her by not trusting her and would cry on the phone (we talked on the phone sometimes) and I would feel bad and think it was just me being scared to be vulnerable... but then she disappeared one day and I never heard from her again, but found others who had also been talking to her and it was the same story.
So, I stopped trying to have online-only relationships. If I couldn't meet a person in public somewhere and see and talk to them in person, I wasn't going to invest in someone who might not even exist.