Of course, it's important to communicate your feelings honestly and respectfully. Here's a suggestion for a breakup message:
Hey [Her Name],
I've been doing a lot of thinking lately, and I feel it’s important to be honest with both you and myself. I truly appreciate the time we’ve spent together and all the memories we’ve created. However, I believe that it’s time for us to go our separate ways.
This decision wasn’t easy, but I feel that we’re growing in different directions and it’s best for both of us to find happiness on our own. I care about you and truly wish you all the best in the future.
Thank you for everything and take care.
Feel free to adjust it to match your style and feelings. It's always better to communicate directly and kindly. Good luck!