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I put an opinion on this previously but removed, guess you don't like to hear anything that isn't covered in sugar and coated to suit your delicate feelings.
So here is the answer you want to hear (although it's a lie) .
She'll come back she LOVES YOU... (gagging) and she isn't sleeping with other guys only dreams of you each and every moment. You're the reason she breathes and lives (choking on my words - ewww bro).
Ok now that you're all pumped up and feeling good enjoy that if she does come back and you keep that hope that eventually you will realize my REAL post could have saved you manipulation and becoming more shatter that you WILL experience if you believe she is in love with you as much as you love her.
But welcome to fantasy land where you can delete honest advice.
So lie on... she loves you still, forever and always ok (preparing your grave for the inevitable doom). Good luck!