I don't think that failing to reply to a text means that you are forgotten about or that she doesn't care. It's just a text. Your interpretation of what it means and how you are imbuing tons more meaning into what was actually there is an issue that worth looking at. It is not necessary to see people's small, isolated actions as indicating something enormous about you or your relationship with them. Continuing on this path of making these kinds of connections will mess up your relationships in the future.

As for quitting T, I don't believe that T is necessary to live a good life, but sticking with it has been helpful for me. Whatever you choose, I hope it works for you.