What title should I put?😆

I met this girl online, and we talk every day. to the point where I'm starting to like her. We act and talk like we are couples. But she never wanted to move on to the next level or talk about her personal life; I never saw her face, and I don't know her personally. She even clarifies that she'll leave me one day and doesn't really want to do anything to me. But she says she cares about me. But I know she doesn't, and I'm just her past time. She's really going through a tough time right now, and that's the reason why I can't leave her even though I'm already hurting. Because I want her to think that there's this one person who will be there for her. I don't know what to do, but it is making me cry every time I think about it, and I feel sorry for myself for choosing her instead of me, but I don't want to leave her.