"Write a breakup text that is polite but firm"

I need to talk to you about something important. I've realized that our relationship isn't working for me anymore. I think it's best if we break up. I'm sorry, and I wish you well.

Hey, I've been thinking a lot about us lately, and I need to be honest with you. I don't think we're right for each other anymore. You deserve someone who's fully in this, and I can't be that person. I really do care about you, which is why I'm being upfront instead of dragging this out. I hope you understand.

I've given this a lot of thought, and I think we need to go our separate ways. This isn't about anything you did wrong - we've just grown in different directions. I have a lot of respect for you and the time we shared. I hope we can both find what we're looking for.