My ex-girlfriend sent me several messages, but I didn't reply. She once said that if she didn't like me, she would delete my QQ for two months. Why didn't she delete me?

Not deleting you just means that she may have forgotten to delete it, and another is that she has a little nostalgia for you, or that she doesn't care about deleting you.

Don't dwell on the fantasy and dream of returning to the garden. Women are the most fickle species in the world, the so-called "women's hearts, autumn clouds."

Judging from your question, you still have some feelings for this ex-girlfriend. Men are always so affectionate, or affectionate and righteous, but women are different. They are heartless and will soon forget you.

I hope you will stop stepping into the misunderstanding and break this relationship as soon as possible. She is just a passer-by in your life.