Be wary of your own desires and imagination about other people; the split and break is all in your own head, scripted by your own imagination. You have decided why she called and what she felt and how it all plays out and she has had no input whatsoever. Consequently, you have orchestrated your own feeling of brokenness.

Why not stay with the nice feeling of her having called; whatever her own reason was for calling; it felt good to you! At that moment, you enjoyed hearing from her. If you only enjoy hearing from someone because they call out of the blue; that's being a bit controlling of others isn't it? How can they know to call you and how can you be the judge of why they called you and how can one's motives be only one thing or another (either out of the blue or deliberate due to duty); I don't know about you but my feelings are often all over the place with lots of input from all directions; wanting something, feeling I "should" do it; all at once. Do you suppose your T had a note on her schedule, "Call Dreamy at 4:32 p.m. and pretend to care"?

Then there's the other note in her Day Timer, "Pretend to be busy and sound abrupt and businesslike to get Dreamy off the phone sooner".