Should I leave my girlfriend and move on?

So my girlfriend of 4 years has fallen back in love with her ex who popped up out of nowhere. I have been very understanding and supportive so far since I looked at things from her perspective. However, if I look at my situation, it's really tough to be in. In this love triangle, there is a story from everyone's perspective. As far as I am concerned, I am unable to let her go. I am still talking and waiting patiently and making constant efforts that sometimes go futile. Future is uncertain. Someone give me the strength.
Should I move on?
Should I stay?
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Should I leave my girlfriend and move on?
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