Two updates (and a question) ...

We normally ride home - by bike - together (either one of us makes a small detour). Last Friday, the person with whom she takes tango classes attended an event too and he picker her up and drove her home. Yesterday, something similar happened: a small event with only a few people. One of her friends (who has a girlfriend, so he is no "threat") whom she knows from before she started dancing and lives very close too her was there too. She chose to ride with him. Both occasions left me very disappointed as these are the moments when I can talk to her easily.

On Sunday evening, I suggested to go running together. I have been playing with the idea for a while and have lost some weight recently so to start running will be less of a burden on my joints. She seemed enthousiastic, then said that where she works out, it is impossible to run together as it is too narrow and eventuall said she would look for a location. I suggested a place and a tour - not too long as it will be my first run since my heart problems surfaced three years ago) and she agreed.
She does have a last minute photo shoot (its her job) on the day we were supposed to meet and suggested a moment next week ...

All this starts to feel like a pattern and I wonder whether she would even notice if I were to disappear from her life. All this brings me to my question. Last week, an advertisement for a learn-to-date course showed up in my facebook. Their catch phrase was "A mixed signal is no signal." Beneath that, they elaborated that, if a woman is interested, it will be clear and she will do anything to spend time with you. All this aligns with my insecurity but on the other hand, the postponing of things suggest a pattern.
I know that an advertisement is made to sell things and that advertisers will go at lengths to achieve this and that they are probably exploiting my insecurity (and that of many others of course) but this quote is playing in my head.

And also another question ... she has been single for two months, after a short relationship of five months and a breakup from which she suffered badly (just so you don't have to read the entire history of this thread). I know it is early to expect things but, if somebody doesn't really feel the butterflies, can this change over time? Or is this really a things that happens when you first meet?