Growlithing, I may be a little unpopular with what I am going to say - but you know I like you and have no intent to hurt your feelings.
I agree with all the others have said.
BUT - sometimes it is important to give someone else a gentle push.

You know yourself, that the reaction you had, rushing out of the room, pouting, being angry, doing the monkey "not hearing, not seeing, not speaking" thing, being unreasonable - (yep, that's a little what you are) and you know that, your responds to this thread show that. So what does that sound like? It is not usually a reaction an adult would have. It sounds like the reaction of a child who is afraid, a child who rebels against an authority figure to keep in control, a child who wants attention, a child whose way to "punish" the bigger people is to pout and throw tantrums.

I know, even if some people will criticize me for saying this, that you know, that basically what happened was a child throwing a tantrum. And it's ok to feel what you feel, I agree with all that. But there is a point, when you will have to react to this as the more adult person that you are too.
So one way to tackle this - after you have allowed yourself to feel what you felt - is to change your perspective from child to adult. And yes, that IS easy! Because look at this thread, the way you express yourself, the way you analyze things - that is not a child! That is an adult. You express yourself really well. And an adult can chose or at least control their feelings, that is our big advantage over children.

We don't have to be victims of our feelings, we can be the gatekeepers of our feelings. If you really want to deal with this situation, your adult side has to become more dominant. Because you know that the T will leave, you know you don't want to punish her for doing that, you know that even though you are not as close to her as LCM, you still are attached and you don't want to lose anybody any more and feel abandoned. If you know all this, in the adult way you can find ways to deal with this - like writing music, keeping a journal, talking about these feelings with the T. You are equipped with everything you need. You are not a helpless child any more.

But, if for now you feel more comfortable in the child mode, how do children get out of their tantrums? They usually cry and scream for a while and eventually they either get what they want or they realize nobody "buys" their act and they calm themselves down - of course with a big frown on their faces to make sure mom knows exactly how much she was hurt her little angel.. :-)
So, when you're ready, you can calm yourself down and it will become easier. Because you know you probably won't get what you want.

With love,
Amelia