John, you have an indomitable spirit.
There is a philosophy which may apply, obliquely, "If someone leaves you, let them go! They're doing you a favor!"

The real lesson is that we can't let someone else's opinion matter if they're hurtful towards us, indifferent to the discomfort they cause, or for whatever reason 'reject' what we offer.
We have to evaluate, determining whether their opinion has merit, but, we can't just grant them merit because they've got the big office and the big name or the big...whatever she had...We have to consider any feedback as Market Research, and, if it has merit, see if we can improve our product with it, taking it as constructive criticism, a critique with a generous eye toward improvement.

And we can't have all our eggs in that one basket. Our whole being should not be balanced on one Song, one opinion, one moment out of a whole day of moments, one girl, one day, or two days years apart. There might be a concept for a Song in that, but I don't know what it would be yet.

In about 9th grade I remember asking a girl for a picture. She said no. I thought she was pretty. She was a woman when the rest of us were still kids. I never asked her again. I saw a class picture decades later and wondered what I ever saw in her. At the time it seemed significant for a brief time. I got over it. I didn't have my heart set on the picture or any relationship beyond asking for it.

So, "Ram on! Give your heart to somebody, soon, right away." and if they don't want it, give it to somebody else.

There will always be another song to be written. Someone will write it. Why not you? www.garyeandrews.com