That's what BF's do is talk about boyfriends and other things. Who else can she tell ? It means she considers you a BFF and someone she can talk to. Consider it a complement.
Then what's your problem?
you should tell him that your best friend has been there for you for everything and that you have to stand by her. if he can't accept that, then he's not a good boyfriend.
you should try telling them how you feel or go over to your ex boyfriend and ask him if he likes your best friend THEN you might want to tell them how you feel depending on the answer.
It can be difficult to determine someone's true feelings, especially in a situation like this. However, actions often speak louder than words. If your ex-boyfriend is dating your best friend, it suggests that he has moved on from the relationship with you. It's important to trust your own intuition and focus on your own well-being rather than trying to analyze his words.
include your best friend into the conversation with your boyfriend.don't just let them hang
They both are bad. If your best friend cheats on you with your boyfriend, she is a NOT a loyal friend. And if your boyfriend cheats on you, DUMP HIM.
Boyfriend or best friend. But its usually used for best friend
Be straight forward with her. Tell her gently that she is being a little to intimate with your boyfriend and politely ask her to stop. If she is a good friend, she'll apologize for her wrongdoings and she should stop flirting.
if your best friend is a girl she may not be ready for a boyfriend if your friend is a boy then he isn't into boys.
if he is a true freind it shouldn't affect your freindship
Answer All you can do is try and get him to believe you. "Best friends" are good at manipulating their friends and it is always for their own selfish reasons - not for the best interest of their friend. It happens all the time and all you can do is your best to convince your boyfriend of the truth. They always find out eventually when someone, like a best friend, has manipulated and lied to them.
Just do your best to show him that he is the only guy you are interested. Maybe cut back on anything that could be considered flirting with his best friend. But his suspicions are a sign of insecurity and distrust, which aren't a good sign in a relationship.