Best Friend is flirting with my other Best Friend's GEEKY boyfriend!?

Ahh. lol. Ok so my friend Sylvia has this REALLY dorky boyfriend named Chester. (oBviously not really names lmfao) And Chester is TOTALLY into her and they've gotten REALLY close, if you know what I mean, but then Chester got a little too intense with her and told her that he loves her and she's not very comforatable saying that so she kind of broke it off with him. (They've broken up and gotten back together 3 ****** times. But they can't deny that they're seriously attracted to eachother) So my slutty friend Bella and I have been talking to Chester ever since Sylvia "took some time". Chester may be a dork and very intense but he's awesome and we're still really good buds. Did I mention that Bella is going out with Chesters bff Lance? Bella HATES Chester's guts for some reason because she thinks that he's a total nerd but she still majorly hits on him and acts like she wants to do stuff with him. So I'm getting pissed at Bells. And now it turns out that Chester wants her...