I don't believe ANY disorder would fog up what works or not. And yes, it is fantasy to think that two people with personality disorders are better off.
If you don't trust him, but choose to stay with him, then shame on you. Your gut is saying go, then go. As for him and his being a "sociopath", if you are aware of what sociopaths do, then why ask this question at all. Of course he will drop you, it's the MO if they are bored. This is based solely on the fact that you believe him to be one. You answered nearly all of your questions on your own, I'm just here to reiterate.
Incase you got lost somewhere along the way:
YES, fantasy to think two personality disorders are better off together.
YES, he will drop you like nothing if you are no longer sufficient, assuming he's infact a "sociopath".
NO, your "disorder" is not fogging up your judgment. I think you're using the disorder as an excuse to make obviously irrational decisions.