Im jealous of my boyfriends best friend.?

Why is something telling me that you are slightly overprotective of your boyfriend? Maybe it's the calculations, that's a bit weird. Anyway, if he tells you that nothing is going on, and you believe him, why don't you tell him that you feel neglected? And if he carries on, dump him, because it's worth being with someone who pays you little attention. What you should be worried about is perhaps why he revolves his life around her, maybe he's just a good person and she's going through a tough time, but if that's not the case, I'm afraid to say it's very likely he's cheating on you. Why don't you speak to this Anni person, and see if she's really depressed or something, because it sounds like she's taking him away from you.