I guess you're just not interested in me after all.
So, I want you to block me.
I'm going to spend my time on other things.

Please stop messing me around.

This situation is quite draining
and I don’t think it’s a good use of our time.
Please, enough is enough.

You're a bit too immature.

Give me back the time I wasted on you.

ビックリした

I am absolutely appalled by your lack of sincerity.

I am considering taking legal action against this entire account.
Please be aware that I have various means to pursue this matter.

It is quite rare for anyone to provoke such deep-seated anger in me.

唖然