I'm not sure how, or what I feel about this. I don't have any problem socializing and such, or dating, but trust, that's a different matter.
However, as Alby said above in different words, if one considers ptsd as being (too) much for another to have to handle, but the ptsd cannot be seperated from one's self, it's hard to reconcile it can or will be acceptable to another, nor should (I, in my case) want to burden anyone else with it.
Also, if even family have been untrustworthy or violent or what have you, and they (technically) should be whom you can trust more, or conversely expect ('hope'?) that they 'would' or 'could' or would want to love you more than a stranger or friend, and they don't, it leaves me wary of what will happen with others, as just me here said about finding out in the long run.
So I'm not sure if it exists, or 'how'. Perhaps it is dependent on the person/ people.
It's hard to know if people are honest, or if they care at all. Or under what conditions they expect. You can only ask them to be honest, and hope for the best. Or give what you yourself need, I always think.
So I agree with what's been said above, I try not to have expectations, because they can be disappointed, and that can lead to resentment or self-blame. And you can't really blame the other person, because the ptsd is unacceptable to them, or too heavy a burden. But you can't blame yourself, either, because having ptsd isn't your choice.