okay so I just got a boyfriend an he's 10x better than my last one but my best friend has a boyfriend and loves him but suddenly its like she is always finding ways to flirt and make him flirt back. The other day in their gym period she hit him (flirting) an he picked her up and threw her over his shoulder like he does to me. I talked to him and he seemed to understand but my friend started yelling and getting mad because I was accusing her. And she suddenly seems to talk about him when I bring him up like "oh well we did this in gym" and "he said this" and I'm sick of it. How do I tell my friend that even though she's got a boyfriend she needs to understand how I feel and that don't like her talking about what they were doing? Even though I've already told her

First of she doesn't seem like a very good friend and you should tell her flat out that she is stepping over the line. You can't stop her from liking him, but you can at least try to get her to back of!

he is taken = of limits...

I know its hard to do this to your best friend cause she will actually stand up to you and you might end up in some kind of fight but you need to sit her down and tell her exactly what's bothering you say: "her your my best friend and thats why i think it important that when u talk to ___ i feel like your flirting wwith him, and it makes me feel really geleouse because i really like ___. and you have a boyfriend so i dont think your doing this on perpose, and your my best friend and i really dont want to accuse you of anything big i just thought i should tell you what im feeling"
Or something of that nature

Good Luck!

You don't need to do anything. Look at it from a different point of view.. She is lusting after someone who doesn't want her. He wants you, which is why he is with you. You should pity her. She might talk about him and the things they've done in gym. But he's your boyfriend at the end of the day. You have what she wants. If you feel worried about the situation, then don't be. When you spoke to your boyfriend he understood! Which means he is listening to you. I honestly think you have nothing to worry about. Take it as a compliment that she wants your boyfriend... she's never guna have him. He wants you.