A (up until recently) friend of mine has gone downhill pretty

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A (up until recently) friend of mine has gone downhill pretty fast.

>she's pretty normal up until a year or so ago
>started dating a marine
>the marine ships out
>skip ahead a few months
>goes to party
>gets fucking plastered and sleeps with coworker
>continues to sleep with him after drunken encounter
>stops
>meets new guy, he clearly is in love with her
>marine comes home for holiday
>she totally drops the new guy for marine man
>marine man leaves
>tries to rekindle with the guy who loved her
>the marine has no fucking clue all this is happening
>after she dropped lover boy the first time, I finally realize what a shitty piece of garbage she is
>try to tell lover boy it isnt worth it bro
>hes on the fence

the fuck. how can people be so shitty? I wanna help my buddy get away from her. What do?