why do guys do this??

so this guy i know is going out with a girl he’s gone out with before.. no big deal right? WRONG…. she’s a psycho BITCH. she only goes back to him after she claims to have a miscarraige with her current boyfriend. she’s been doing this since HIGHSCHOOL. and he hasnt realized how bad she is. he’ll be with her and sooo happpy and in love then she fucks him over and he hates her… every single freaking time… no exceptions. well i thought his friends got through to him and he was gonna move on but she sucked him back in and he’s saying she’s “changed” and she’s working on the things she did that made him mad. BULLSHIT. this will never happen. shes just gonna stay with him till another “love of my life” that she’s “soooo glad i found him” and “never been happier” comes along and she’ll fuck over my friend AGAIN. then she’ll go psycho bitch on her new bf, get broken up with, claim a miscarriage that won’t work and go back to the bf before. LIKE ALWAYS… i’m so fed up with him. he’s been ditching his friends, seeing only her and not making an effort to hang with anyone but her. someone who’s will to lose ALL of his friends(thats what’s happening… no one wants to hang with him anymore) for a psycho bitch isn’t worth my friendship… i’m sick of the bullshit.