Me and my girlfriend got into a argument?

My girfriend told me that she was on the phone with her sisters exboyfriend and he told her he wanted to meet up somewhere to see her.When my girl told me this i said i dont want you to see him cuz i dont really like the guy he sets off a bad vibe and i dont trust him now im not trying to tell her wat to do but im just trying to protect her cuz i heard bad about him.Now wen i told her that we started to argu and then i tol her if your planing to see him ima dump you n she said well hes my friend n i like him alot so i dumped her.The next week she comes over n i just ignore her cuz im kinda still mad about wat she said but then he comes over n she n him start to talk so at this point i anit mad no more cuz i dont care anymore.Then before she leaves home she told me can you call me tomorow so i did n we start talking n she told me that she told him she dosent want to be friends anymore and i said why you do that n she said i did it for you cuz i still like you n i love you...i was just trying to protect her cuz i heard bad things about the guy that i didnt like n i care for her n love her alot but should i get back with her cuz at first i felt that she choose her sisters exboyfriend over me n im a guy who treats her right...should i get back with her?