What does she want to express by deleting her predecessor and sending me this text message?

In other words, because you didn't trust each other before, there is no fate.

Now that you are dating, if your lover proposes to remarry, people can agree without hesitation.

Now that we have broken up, there is no need to contact again, which will bring trouble to both sides. I suggest you blacklist the other party's number on the mobile phone WeChat, and don't receive any news from the other party. If you receive it, don't answer it, and don't answer the phone.