Is my best friend trying to give me advice? or being rude?

My ex boyfriend still has my best friend’s guitar. my friend and I live togather and she had let him borrow it while we were togather, now that we have broken up since a few months ago we have asked him to bring it back and every time he did not bring it back.
My friend sent him a text message asking him to bring the guitar back because it is important to her, and he said he would in a couple of days (but again, I dont believe him). I said to her if he does not bring it back this time atleast show your angry so he’ll take you seriously. She said to me anger does not solve the problem and also replied “thats why he broke up with you, your always angry”... I explained to her that it hurt my feelings and she said she was just giving me advice and that i was over thinking her statement, then left the conversation…
what should I do?