Well, that's kind of a grey area because Halloween is the one time of the year when even the most conservative woman dresses up like a sexy cat or a sexy zombie or sexy Occupy Wall Street Protester. It could be that he legit liked her costume. And what better way to show that than "liking" a photo?
Yes, if her costume is super skimpy, it might be more suspicious than if she was going as a nun. (Though there are plenty of "sexy" nun costumes out there for sale.) But with all things, context is important. Is he frequently "liking" photos of this female friend in various states of scantily-clad dress? Does he constantly comment on her status updates? When you ask about her, does he readily share information or suddenly get weird and cagey? If it's just one random like on the day when everyone posts photos of their costume and toss out "likes" willy-nilly, I wouldn't sweat it. If it's part of a pattern of sketchy behavior, then you might want to bring it up.
If you're worried about him "liking" a photo that happens to be of a female, there's probably much bigger problems in your relationship.
THIS. x100000.
Not enough info here. The asker had plenty of room left; why didn't she include a description of the costume?
Anyway, I think that in general, I wouldn't worry about "liking." Now if he leaves an inappropriate comment, that's when you can worry.
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