My girlfriend and I are very angry. What should I tell her if I want to break up with her? ...

Now that you have decided to break up, break up.

Two people together, if unhappy, it is useless to force together.

So when you decide to break up with your girlfriend, be firm.

You can text her like this: I'm sorry, I've been thinking for a long time, and we really don't fit in. Let's break up, which is good for everyone, because we are all stubborn, so there is no future together.

Let's get together and part. I wish you happiness. You will find someone better than me.