Wow that was a tough day Spider, and yes we can be too trusting. I'm glad you made it through and learned a thing or two. Me too lately.
Mostly when I cry I just get tear up and stop. Once in awhile I'll really have a real cry, only around safe people or when nobody else is around.
Not that I cried a lot when I was a kid, but I got hit for it, so even though I remind myself I am allowed to cry and nobody is going to hurt me for it now I'm still self conscious and can be somewhat guarded about it. I'm not very comfortable with any strong emotions, and it's good for me to hear I'm not the only one who gets left feeling the odd one out when everybody else is upset, and I'm not and can't find a good reason to be.
I'm often confused about this emotion in a similar way to the rest of you that probably has nothing to do with the abuse. The general lack of crying was handy working in the hospital because situations that overwhelmed my coworkers emotionally would have them in tears in the nurses station and I'd still be working, puzzled over what about the situation had them so upset (because it wasn't personal...these were strangers). I simply couldn't see how tears fixed/helped anything, and I was told my detachment is a gift in some situations. It helps me make logical decisions when people around me are making emotional decisions, and that's not a bad thing.
My meltdowns are emotional and at the end logic is always waiting to go "Ok, now that I'm done with that, what was/is the problem and what can I DO to fix it?". I've also noticed I am a lot less upset on a gluten free diet. That has improved a lot of things for me.