I found out that my partner purchased a new bag for herself with my credit card. She did not even bother to let me know or ask me before using it
WOW, I would be quite upset,  Atleast let me know before you do that!
Indeed. I was quite angry at her for behaving in such a careless way. She did not even apologize to me for her actions
wow, Thats unbelievable.  Did you let her know it upset you?