So my current girlfriend got pissed at me and basically told me "we're not hanging out this Thursday at (insert restaurant name here)" and I enthusiastically replied "That's fine with me lol your loss, more for me!" To make a long story short she got all upset at me and I just decided to not respond to it. Now, an random number texts me being all like "what you did was wrong towards your girlfriend" "it's a form of emotional abuse" "you should be ashamed" etc etc. Seeming as I don't know who the individual texting me is, how should I respond to it? If at all?