Well, as I see it, you have nothing to lose at this point -- 4 weeks of no contact from her -- by sending her a quick email or text, to let her know your feelings and your decision (if you've made one). It's better to just tell her how you feel, if it's going to bother you that much -- the not knowing why she's been silent.

She should at least give you her decision. Does she want to stay together, or does she want to break up?

She owes you that much. To leave you hanging, in limbo, like this, is cruel (no matter what the reason).

So, I say, why not just touch base with her to ask her for her decision: stay together or break up. No one who has been in a relationship should ever be "ghosted" on like you have. That's just disrespectful and rude, no matter what her insecurities are. Manners are manners. If you don't want to be with someone anymore, it's best to just show them some respect with your answer. Does that make sense?
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I would never wait 4 weeks for a man who ran from me, to give me an answer, because the 4 weeks of no contact technically *is* his answer.

I can't say that is true for your girlfriend since she has done this "ghosting" to you before, but to do it a second time, to suddenly make you an option in her life is just plain ol rude and disrespectful, without having had a discussion with you as to limits.

Like, "I just need a month alone, then i will call you and we'll get back together," or "I need a month, and then I will let you know if I want to stay together or break up," or "I don't want to be together anymore, " or "I do want to be together."

When someone whom you're in a relationship with, goes that long with no contact, usually that is not a good sign. If it is bothering you not knowing, (you have a right to know btw), then I think you should just contact her and ask her, "what do you want? I haven't heard from you in a month, which I interpret as you aren't interested in being together anymore. If i don't hear from you, I will assume that means we're through." Or something to that extent.

I think you deserve better treatment than the silent treatment. Just my two cents.