I'm jealous of my boyfriend's cousin

jennyloves
So I have a new boyfriend. We were dating for 3 months maybe 4 and we finally decided to make it official! I'm only 20 and my boyfriend is 36 . He is a sweet guy and all but he has a female cousin who I can't stand ! I don't know her personality but she always post stuff on his wall on face book ! Like I love you and win will you come over and things like that <3 it kid bugs me ! I understand that she is his family and she was in his life way b4 I was but I feel sometimes as if she wants to be more then just a cousin as creepy and controlling as it may sound! She text him during Christmas day Win he should have been paying attention to me and his fem on that day because I went over his house on chritmas eve and day ! it really annoyd I kida whated to grab his cellphone and tell her to back the hell up but that is his COUSIN AND that just push him away from me ! he would tell me that they use to hang out a lot and he would take her everywhere with him b4 I showd up in his life . and now she always sends him Facebook wallpost and he calls her cute names he don't call me :( what should I do is this close relationship with his cousin going too far?
I'm jealous of my boyfriend's cousin
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