My best friend's got a new boyfriend and she's happier than she has been in ages.

But I'm not happy for her. At all. Because she doesn't have time for mememe anymore!

I know...

i have found that usually girls will choose their bfs over friends thats why i really dont like them

You're not a bad, bad person, you're a human, normal person.

But, um...use your free time to pursue your own interests.

Ouch. I think we've all been there.
But how long have they been together? And is it that she has no time for you at all now and cancelling plans with you at the last minute to hang out with him and when you do see her all she talks about is him? Or is it that she sees you slightly less now because she's got one more person in her life who she needs to make time for? Because if it's the latter, that's fair enough. If it's the former, that would piss me right off (and has done in the past). Even so, give it a while. They're probably in that "first flush of romance" stage where they can't stay away from each other. Awwwww.

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Why do we even have that lever?

It's okay don't worry. It doesn't mean your jealous but just lonely. You just gotta find the good balance.