Thank you Proffitt.
I talked to my girl and she sent back the text messages to me. Happen ending, right!
I think you are right, when I search the question on google and I get many webpage about how to solve the problem. I downloaded some of the software and use the trial version. I also see many spam threads on other forums about this. Anyway, I solve my problem.
I just deleted my text messages with my girl from my iPhone 6. I didn't mean to do that. I was just an accident. I don't have any backup file with iCloud.