Sorry to hear about your breakup Jason. I have been on your end of this situation so many times in my life. Hell, the night I met my wife I decided I needed to eat tacos at 5am because I had gone with my cousin and his girlfriend to some club, spent $100, and looked like a nerd that can't dance to the girls his girlfriend had brought to the club. But guess who passed by my favorite taco joint on 23rd street at 5am with her friends? My wife.
Don't second-guess yourself over dumb stuff like why didnt you send the "How's your day" texts. It's pointless and for all you know, the next girl you'll date won't be into that.