Why is she so afraid I'll leave her?

Anonymous
Hi all,

My girlfriend and I have an AMAZING relationship. She deeply loves me, and I deeply love her. Its almost like we have the perfect relationship, in fact, she says that she has a lot of jealous women over her having me. One thing I have been wondering though, is why my girlfriend is so terrified that I might leave her.

Now, I do realize that she is somewhat emotional, and has admitted she tends to worry a lot. She also had an ex cheat on her, so that might add to her fears. In addition, I admit that I have been burned by some girls in the past, and *long before we became closer than just friends*, I did say that I wasn't really sure if I wanted relationships anymore, since based on past relationships, I always get screwed in one way or another.

But she's different. I can tell she is deeply in love with me, and is not out to use me or lead me on, like the rest of the girls I had in the past.

She has said she has had a nightmare about me leaving her, has broke down crying when she's lonely (when I am not around-like at her work) because she is scared to lose me, and seems to talk herself down every so often, saying "you'll find someone better than me," (even though I emphasize that she has really got all the qualities and more in a girl that I want; I never had to lower my "standards" for her).

So my question is, why is she afraid I'll leave her, and what are some ways for me to reassure her that I am not (besides telling her I won't, which I already do)?
Updates
+1 y
Another question: Could she have abandonment issues? I looked this up, and so far, she seems to display some of these symptoms as displayed on the 'net, but I am not sure. What do you think? Thanks for all of the answers so far, by the way.
Why is she so afraid I'll leave her?
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