<human>: Can you succinctly summarize the text in 1-3 sentences?

We used to communicate every night, sometimes over the phone, sometimes via text or via video chat, but last month abruptly without any indication or reason on her part, she simply stopped responding to all messages and calls.

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I've off and on tried reaching her, but I don't want to unnecessarily seem desperate and off-putting should things not be the way things seem.  I have to assume that she's ending the relationship in her own cowardly way by simply severing all contact- It's unfortunate since we've spent so much time together, and I feel I deserve more on her part, but it is what it is.  Our relationship hasn't always been LD, that's a fairly new thing, though again, aside from the span of this past month, there is nothing that would indicate to me that she was either upset or disinterested with what we had.

Anyways, since I really don't have a definitive answer from her, I can only assume this to be true, when/should I assume the relationship to be over?
<bot>: GF of 2 years has been silent for a little over a month now without any indication that a breakup has occurred.  When should I consider the relationship over if I shouldn't already?