There's nothing wrong with wanting something someone else has, it's how you go about it. I don't often like using the term "jealous" I prefer "envy" because people usually confuse jealously with hating someone for having something you don't. I would never hate someone for something so petty, but sadly, a lot of people do.
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I agree with this. It's okay to desire another persons things or envy (cwutididthere) a girl as long as you're not going around wreaking havoc on everyone else's life just because things didn't go your way.