He probably isn't interested anymore or maybe he is with someone else now. His sister probably isn't talking to you because she doesn't want to be the one to tell you. I agree...... get over it.

Good advice, children! "Get over it!".
Yeah, how about we try the mature, adult fashion, and NOT scare this girl away. We don't know that he's not interested, or cheating, or with someone new. We only know that he hasn't responded to the OP. His reason could be many things. She doesn't know it, nor do we.
We should be helping her out, not being asshats and making her paranoid.
1 1/2 apart? In what way? Hours? Thats a joke if it is. And your myspace says your 20 and you don't have a phone capable of long distance? I can't say I know many logical guys who would go a month without talking to their girl, period

One in a half hours is quite some distance. I hate it when my guy is thirty minutes from me. Love knows no boundaries, but pain does. And, not everyone can afford a cell phone, let alone one with long distance. Just because someone is twenty, doesn't mean they have all the 'new technology'.
I can't say I know many logical guys who would go a month without talking to their girl, period. 
Sometimes, we all need a break from our significant others.
"Get over it" is not a plausible response to this poor girl's suffering.
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*Forever & Always...Yours*