Do you think I should be suspicious about gf deleting outbox text?

maybe all the time, and she says that its because she texts alot and it gets full. I find it weird that she seems to delete it right before I come over to her house on the weekends.|||Aaaaa yea鈥he is hiding something but I don鈥檛 think I would worry about it. if she wanted to be with someone else she would be