IS this LOVE or just pitty? please give advise.

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i have a friend and she has a boyfriend and they dating for a weeks. then she came to me what is happening to me why can't i leave him i know it's just a fling. his boyfriend have a broken family and she is the one whos comforting him always. shes reason why he can't leave him because of her boyfriend situation but her mind telling him to let go. what should i say to my friend. hope you can help.