What are Signs of a narcissist?

Hello I’m a “23M” and my ex is a “22F” . I was with her for 5 years, I am not here to bash my ex or anything or make her sound like a bad person, however I have spoken about people about her behaviour and they say she is a narcissist, or has traits of one.

Some incidents that have happened include :

She has cheated multiple times, denied it all even with proof and played the victim when confronted and then saying people are spreading “ lies” and she is going to take legal action.

She has one set of rules for her and another for me

I wasn’t allowed boundaries

She would block me after an argument and then unblock me and ask me if I still wanted to go out somewhere, without discussing the situation I’d want to talk about the situation first and she would get angry saying I’m making excuses not to be with her and that I don’t love her and say I’m rejecting her.

Sometimes when she would block me, about a week later I would get no caller id throughout the day, I would answer some but no one would speak.

She has threatened multiple times very early on in the relationship by recording me reacting to her abuse and said she is going to post it for everyone to see. This was very traumatising for a 17 year old , I should’ve left but didn’t know any different.

She would accuse me of cheating , talking to girls and was obsessed with my ex girlfriend which wasnt a serious relationship, just young love. She would stalk her constantly, make fake accounts to try talk to her and get information out of her.

She got a guy she cheated on me with fired from their workplace by saying he assaulted her because she found out he had a girlfriend .

She has major FOMO , she gets upset when she “ misses out” on something and calls herself a loser because of it

She is so invested in this family friend she has , her life, that she’s engaged, she could talk rubbish about her for hours which I found really strange

When I have tried to give her advice on something she’s struggling with she gets very defensive about it and tells me to fuck off and stay out of it.

She does not care about if I had a problems I am not looking for sympathy but if I’ve had an issue she will just say “ idk what to tell you go get therapy then” but is very empathetic to other people’s issues and seems to understand them. When I’ve tried to talk to her about something, she would either fall asleep, sigh or straight up ignore me or start doing something else to change the subject.

She forgot my birthday twice in a row because she was cheating on me, and I didn’t know

Please let me know your thought or opinion.