I was about to reject a girl...but she rejected me first

So I went on a date with a girl last week who I matched with on tinder. Whilst I had an okay time, there was no real chemistry there.

I was planning on just not messaging her until she got the hint. I think that's more kind than sending her a rejection text. "Whilst I had a good time I don't think it will work".

She just sent me the rejection text though! I have no feelings towards her whatsoever but for some reason I feel kind of hurt haha and maybe even pissed off.

Any of you psychiatrists out there be able to me why I feel this way?