So even if she texts me Good Morning, don't respond. Cuz she is, and I do feel like she's just testing to see if I'll respond... Testing the waters to see if I'll budge.
Don't you remember the "friend" discussion, she wanted to remain friends and you told her that it wasn't a good idea. Well she's seeing if you're sticking to your guns or if you going to back down from that idea.
Seriously bro, in reality, you can do WHATEVER you want. If you want to text her back 2 words: "good morning", do it, if you don't want to do it, don't do it. You're an adult, you can decide what YOU want to do. That's part of being an adult and part of being a man, doing what you want to do because you've decided that's what you want to do. All this indecisive crap will kill a person's brain after a while, should I? maybe not? but maybe I should? I'm not sure what I should do? BLAH, BLAH, BLAH