What do you think
Is it plain speech or are there always hidden meanings??
Anyway it doesn’t matter…
Means:- I will never forgive you for this
Don’t worry….all forgiven…
Means:- Never forgiven
Look it’s fine….let’s forget it…
Means:- I never will
Of course it’s fine…
Means:- It’ll never be fine
I’m fine…
Means:- I’m deeply hurt but don’t want to talk about it
It’s whatever….
I’m really upset but I’m trying to hide it
Let’s agree to disagree…
Means:- I think you’re completely wrong but don’t want to argue about it anymore
If that’s what suits you…
Means: It sure as hell doesn’t suit me, but you don’t care about that
Do what you want…
Means:- I strongly disagree with your decision, but I can’t stop you
Doesn’t matter…
Means:- At this moment ….ask me again in 40 years and I’ll remind you
Any others you’d care to add? 😊😊
Still Waters 
I hear what you say…and intend to totally discard it.
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Ouch. And just to add to the complexity sometimes those phrases mean just what they say.
And another. ‘Its your decision’ meaning my way is the right way.
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I am nodding to so many of these! LOL
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It’s up to you.
But you better make the choice I want.
If it’s, Completely up to you, there will be violence if your choice is wrong.
I’ve just realised you covered that already with If that suits you, so I’ll leave it up to you as to whether you delete my comment or not.
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So often there is a hidden meaning. It depends on the person and circumstances. I will give a polite reply, ‘you’re welcome’ for instance while inside I’m wanting to give them a kick in the backside. A smile and a few nice words gets you out of a conflict that you don’t want to start.
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I’m sorry you feel that way. Means you’re wrong, I’m not sorry, and you’ll keep. (Which in itself is a good phrase.)
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I think often there is a hidden meaning. My least favorite, “I don’t know what to tell you,” which means the speaker doesn’t want to talk about it.
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