What is the line between being understanding and being pushed over?

Girl has depression. She has massive public breakdowns on social media. I am kind of seeing her. The thing I don't like right now is that she'll be hot one day and messaging you throughout the day and other days just ignore your messages. Then when she messages again, you feel like you have to respond to her cause she is going through a hard time.

As she is suffering from serious mental health issues, part of me is like it's okay just be understanding. However, she'll be online for hours and not reply to me. Where do I draw that line? I know she has one beta orbiter (she blocked recently and then unblocked for reasons I don't know why) so no idea if she prefers speaking to him over me?

Anyone have any ideas?

What is the line between being understanding and being pushed over?
Post Opinion