FH, even without the text you're going to have a strong emotional reaction to ending a relationship, especially against your own inclinations. It's hard to do the right thing sometimes, and I wish I had been as strong as you at certain times in my life.
The text is pretty mild really, just a reaction to being dumped, but coming now it's set you off. Glad you had a really good therapeutic cry, and I hope it releases some of the tensions in your mind and body.
The future is bright.