Ghost has proven he has a love for the ideal, untouchable, the mission, what he believes in - he must love it, or he wouldn't put it ahead of everything else. It trumps his health, his hobbies, his personal comfort, his grudge against Stark, everything. I believe before she played him, Ghost loved Shana, at least insofar as he understood love. He was eager and naive and idealistic and a little deliberately blind, because even if she hadn't been using him for Omnisapient's money, she'd be using him for his own money (just...he wasn't that attractive and personality wise he was difficult to connect with, not saying pretty girls can never like unattractive fumbly guys, but it wasn't that likely in this case).

I also believe he is attracted to Moonstone, based purely on how nervous he is around her, and has a fair amount of lust for Satana (based on how her demonic attention totally short-circuited him) but ultimately he is more comfortable with people who he feels understand him, or at least who he feels he can understand (cyborgs, criminals and social deviants!)