Hey so my best friend has been acting really weird and horrible towards me lately for no apparent reason at all. I think she may have Bipolar disorder (she hasn't been properly diagnosed but she has it in her genetics and was told by her doctor when she was younger that she may have it). The problem is if I knew she did have it then I would have no problem with the way she is acting towards me but I'm unsure if she is just being a bitch (she has been acting nice to other people just not me). Can Bipolar people be nice to certain people during a depressive episode but not others? so far I have avoided talking to her about it because if she does have the disorder I don't want to make her feel worse. Should I talk to her?