I've been with my girlfriend for a year. Text her as long as possible.

Hello, you can send a short message like this: Dear, we have been together for a year before we know it. Think about how time flies. I am very happy in this year. Every time I am with you, I feel really happy. It is my blessing to meet you in this life. I will love you and be good to you forever. I hope we can have a bright future.