ok been in a relationship for a year, we broke up and now we fuck on and off randomly, she desperately wants me back. i screwed myself and i let it slip that i hooked up with other girls at a party, now shes sooo mad, and i dont want her to back off completely, like i still like her. advice on how to get her less angry?

So your not in a exclusive relationship right?
BUT your not in an exclusive relationship right?
*sigh*
why would you tell anyone that? curious...what was the responce you were hoping for?
I see this at best as self sabatoge...
"hey i like you and your really into me and we hook up and all, but btw I was with a few other girls this weekend at a party... wanna fuck?"

really???
See here is the problem

Your really playing with this girl... pushing and pulling just enouph so that she will stick around and fuck you...
which is fine... but just know that your using her...

she wants a relationship.. you want an FB... its always going to be like this...
this is how you get crazy stalker girls who break into your apt. and cut the heads off teddy bears and leave them on your bed... while trying to crash cars into your new girlfriend.

=)

I know its a bit harsh, but it comes with the territory
you like her or you like her pussy?

seriously... do what you will... but this is one of those instances where you either have to decide that you want to still be with this girl.. or sit her down in an open area with lots of witnesses... maybe in an airport where metal detectors are active.... and explain to her exactly what you want out of the relationship...
be prepared for the consequenses...
but dont drag her on like this... unless you want to get back with her..
then by all means explain that to her and jump back into the relationship.

JMT
Lucky

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150 people are killed every year by Falling Coconuts.... 10 by Shark Attack.

I couldn't find any stats on death from approaching a woman.