what will happen when your girlfriend's ex-girlfriend come back in her life to get her back while she already happy with you,her present girlfriend?

will you sacrifice for your girlfriend's happiness? but at the same time, your jealousy didn't help at all..

Is she really love me?? or i'm just a rebound for her to forget her past?? - jessica

i love you,jessie..only you,remember that - sooyoung

do i still have a chance? she seems like she still can't forget her ex-love - taeyeon

i know i've made mistake..but can you give me a second chance? - tiffany