what is the best PUA atitude for this thing? I heard that you have to decline invitation and shit to have values?! And also, I started to like one of my girl-friends.

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BELIEVE IS STRONGER THAN DOUBT

She's already "one your girlfriends" so you don't need to appear busy all the time to try and milk some more value out of the situation. You've shown enough value to this one so just go to the game. There is nothing you should be keeping in mind to be honest, you're going to have a good time with a friend.

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Your momma's so fat when she walked past the TV she was going to the kitchen to get cake 'cos she's fat.

I've never heard anything to suggest you have to decline invitations to have values. Anyway...

Have you ever said anything to her to indicate that you like, or are interested in, basketball? If so then she is going out of her way to contribute to your lifestyle which is good. Either way she is trying to spend time with you so as long as you don't completely hate the sport or honestly do have other plans that day I say go. Unless, of course, you're not really interested in this girl in which case it would be a bit shitty of you to lead her on and take gifts from her when you have no intention of giving anything in return.

As for starting to like one of your girlfriends, great man Just be sure you know what you really want. Be true to yourself. If what you honestly want is an exclusive relationship with this girl (which is what I'm getting from what you said so correct me if I'm wrong) then there's nothing wrong with starting to like her.

Go to the game! You don't have to reject her every time. Basketball games are such a guy thing!