My cousin is ignoring me for no reason (I miss her), what should I do?

Juliana77
Last December/January, me and my ex boyfriend broke up, because I found out that he cheated on me...We were together during 3 years and 5 months, so he got closer to my friends and family.

And within 2 weeks since we broke up, I received a call from my cousin """Maria""", saying that he showed up with a girl (who is now his girlfriend) at her apartment, and they had a nice time talking together...However, she told me bad things about his 'new girlfriend'...

I was super insecure at the moment, and I'm very sensitive, so I asked her to not become friends with this girl... that this would hurt my feelings, and she said "oh, for sure, you didn't even need to ask me this...I would never do that"

BUT, one week later, I was about to write a message to my cousin at her orkut (similar with Facebook), and I saw many messages between her and that same girl, like they were best friends and everything, saying 'i love you' and talking about hang out together...

I was shocked, (and disappointed because she lied to me) so I decided don't send her the message...and that I wouldn't talk about this with her, just pretended that I didn't know, because I had to respect her decision...

But since she's really close and friends with this girl and obviously with my ex boyfriend too, she stopped calling, messaging and visiting me, we totally lost contact...

At the moment, I really don't care if they are friends or not anymore, I just don't get why she is avoiding me and changed her behavior with me...

I already had forgotten about it... but accidentally, we both visited our grandpa at the same time, and she behaved as she used to be, and I can't deny that I was missing her, so at the same day later...I called her, and she didn't answer and didn't call me back...! So, she's avoiding me again...

Even that I think she was unfair and lied to me, she's still my cousin and I care about her...

My friends and my brother told me to 'let it go' once I already made the first move (called her) and she ignored me again... But I'm afraid to regret about it later...=(

Please, any advice? Thanks!
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Thanks everyone for answering :)
My cousin is ignoring me for no reason (I miss her), what should I do?
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