Ironically... When I'm popping my head into the supporter's forum, I'm usually talking from the PTSD standpoint (my view of me, not anyone else).
But this is from when I've dated other people with PTSD:
Boundaries! :D Not anyone else's but mine. What I'm okay with to what I love, and what I'm not okay with to deal breakers. I've tried taking on other people's boundaries before, and that's just like squeezing into jeans 2 sizes to small. I can do it, but it's both uncomfortable and limiting. (Can't. Breathe.) This has taken a lot of trial and error, and I've screwed up in each direction (leaving someone I'm fine with and society isn't, and staying with someone I'm not fine with but society is).
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For example... Here is a short (incomplete, obviously, since there is one item each) list of some of those boundaries that my friends hate or love inverse to my own:
What I'm okay with: A certain level of wanton destruction. I have no problem with the periodic atomizing of things that aren't special (either sentiment or price, and we'd better agree beforehand), as long as they're cleaned up or repaired on the QV, and it's a vent not a manipulation. Aka, throw something because you're mad? Fine. No worries. Throw something because you want to intimidate me? Hell no. Over the line. Also, give a girl some warning. Loud noises make me jumpy when I don't know they're coming. Either have enough self control to let me know ahead of time if I'm home, or be loud enough I can hear you coming home so I know to duck.
What I love: Sudden overwhelming need to go be or do something very physical. These kinds of things make my day. And noooooow for something completely different! Love it. Especially when I can come with. And I do tend to hook up with guys who like to go do the same kinds of crazy stuff I like to, I just need am excuse to drop everything and go. But even if it's something they wanna go do alone, that suddenly gives me a few uninterrupted hours of self indulgence.
What I'm not okay with : Saying things you don't mean when you're mad. It doesn't matter if you swear 1000x you didn't mean it, I won't believe you. ((I get a little semantic with this one. I can very much give a free pass to things being true in the moment, that are no longer true 2 minutes or 2 days later. 'Yeah, yeah, yeah, you always hate me before coffee. Harden up. We're out. You'll just have to hate me until we can go through the drive through or the store. Yep. I'm a cold heartless bitch. Keys & pants, mister. Try not to kill anyone on your way out.'. Is something I'm fine with / doesn't affect me at all.))
Deal Breakers : Don't feel sorry for me. Be nice, sure. Be extra nice if I've just had a lousy run. But "You're so broken, and it's so terrible, and..." Oozing sympathy and pity either infuriates me or makes me feel hopeless and worthless. Neither of which is how I'm willing to live my life.