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I don't care.
It doesn't matter to me.
I have nothing to do with this matter . so , I do not care .
It makes no difference (to me). -- I don't care one way or the other. -- I don't give a damn/darn/hoot/crap/sh*t/f*ck. (The last three are vulgar.) -- It's no skin off my back/teeth/nose. -- So what? -- It's not/It ain't my problem. -- That means nothing to me.
I'm sure there are more, but those are the ones that readily came to mind.