Sounds like you need to give yourself more time maybe? I'm no pro, but I can relate, as recently I had cut things off with an addict and just a few days ago I met someone at the bar and she was very complimentary and I didn't care to hear it nor believed a word she had said. I'm also the same with texting like you described, I used to always feel the need to reply to someone after they sent a reply, but I have learned not to anymore, nor care if they reply right away or not. Blah!
Hope things work out for you.