<human>: Could you distill the essence of the text into 1-3 sentences?

I'm feeling guilty because she has some real issues going on - her bf is having trouble with a long-term illness, and she has occasional mental health issues herself (actual OCD, depression).

But I'm feeling really lonely at the moment, and I want my best friend back. I want to help her, and I want to be there for her, but it feels like she's just wilfully ignoring me.

I don't want to be another burden on her, she has enough on her plate, but when she shuts off from the world it makes me feel really shitty, and frankly, lonely.

I know that I should give her the space she needs/wants, but I really can't deal with this push/pull relationship we seem to have at the moment. 

This happens about once every two months, and what generally happens is I'm fine with it for a while until it all builds up, then I sent a text with the more or less concealed subtext of "wtf man?", then after a loooong pause she'll finally reply with what she's feeling and why she wants to shut off, which is utterly shitty, and makes me feel incredibly guilty for being needy and adding yet another thing to her list of worries.
<bot>: Feel guilty for wanting my best friend to reply when she wants to "shut off from the world", I can't deal with my friend shutting me out all the time.