How do you break a relationship without offending them

What I do is kinda cruel but I have some ways you can be polite about it!

You can say
I want to break up. It’s not you or me, it’s Us! And I think that we’d be better off with different people. Break ups happen all the time and I just think that this isn’t going to work out.

Or
My friends don’t want us to be together
And we’ll Im kinda thinking the same thing now. Not to be rude obviously but I think there are better women out there for you and I just think it’s best if we split

Or
Im really not feeling this. Like I’m not feeling this relationship and I just want what’s best for us both!❤️

Or
My family realized my grades were down and they said I’m not allowed to date until they’re up
So I need to focus more on school

Or
Im going through some tough times with my family and I think we should just be good friends till it’s over because It’s a lot for me to handle