Should I stay or should I go?

So me and my boyfriend of almost 5 years called it quits recently. At the end of the day we ended up calling it quits all because of some big misunderstanding, I mind everyone though that this isn't the first time something like this has happened and on top of everything we had just agreed to get our own place together! So now here I am, in this new apartment newly single and kinda broken.
I started talking and hanging out with an old friend and one thing lead to another and we hooked up... twice.
I feel like a horrible person because now my ex wants to get back together and try and work things out but I feel as if after all of said events that I need my space. Basically I just feel stuck and don't know what to do... HELP!
Should I stay or should I go?
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