How do you deal with a high maintenance person? Would you explode too?

You should never have let it get to this point. You need to set your own parameters; what you will accept and what you will not accept, clearly this woman is way over the line. You need to tell her that this relationship is not working for you and you are calling it all off. In future, do not contact you for any reason, period, if she continues after that, avoid, block and ignore, this one will chew you up and spit you out, she is an emotional vampire sucking you dry until YOU stop being her victim.