Worrying I might have realized my girlfriend has serious empathy / possibly narcissistic problems, advice?

NARCmagnet

My girlfriend and I have been dating for almost a year. Thankfully (so I thought) I rarely have to bring up any uncomfortable issues/problems with her. 4/5 months ago I discovered her ex sent a pretty rude/nasty/disrespectful text to her. She never responded to it. *this was discovered on a drunk night a friend of hers left her messages open I didn’t access. Anyway I was furious and asked her to block his number. She did. Two weeks later I asked if it was still blocked. It was. The other day her message screen was up and low and behold, some drunk nonsense text from him, she didn’t respond. She said she saved it to show me. I reminded her she said she blocked him. She denied she ever blocked it and she wouldn’t agree to that and started yelling at me that she’s not a petty child and then brought up things I had done in the past and flipped the argument to that. (He was dating some other chick the last year of their relationship and was cheating on her. This relationship of theirs was 2 years ago) also we were sober when these discussions occurred didn’t have them after a night out.

Thoughts? Should I be upset? How do I approach this?

Worrying I might have realized my girlfriend has serious empathy / possibly narcissistic problems, advice?
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