I'm a little bit obsessed with this plot point, actually - yes, I concur, he has always refrained gallantly from ogling her. This is a good thing, and one that marks him out as different to her, and adds to her sense of being safe around him.
However, there have been moments (Green dress obviously) when his attempt to refrain from looking at her hasn't been un-noticed and when she thinks about that, and that that he might find her attractive (she uses the phrase 'didn't disavow' the appreciative glance) she realizes it doesn't make her uncomfortable, but happy.
My reading of their dynamic is that Strike fancies her and suspects it's mutual, but resists because of his pessimistic view of love and romance. That seems to be shifting in ch 73 of TB, but that's been his perspective for the most part.
Whereas Robin is much more complicated internally. She's certainly got feelings for him, and they're even sexual feelings (see ch53 TB and it occuring to her there is a bed upstairs) but she hasn't quite defined them yet and there are moments she feels guilt about being a sexually alluring woman. Her reticence is based, as Strike, in not wanting to damage their mutual vocation of the business.
But crucially, it's not general pessimism about love on her part, it's her doubt that Strike sees her that way, so that any overtures she made would be rebuffed (because she's not dramatic, interesting Charlotte, which is what she assumes he likes).
The only way out of that particular cul de sac is for her to begin believing that he does see her that way, and as I've mentioned, there's evidence in the text that she doesn't find that an uncomfortable thought.