Really he hits on her every chance he gets, fully aware that she lives in a family like relationship. And he isn’t exactly subtle about it.
How about the best line the movie:
Lois: Richard takes me flying all the time.
Superman;”(slyly) Not like this.
I don't think that Superman's line was meant to wreck her relationship with Richard.
More, it seemed to me that Lois is very confused at this point--up until that day and for the last five years, she'd thought that Richard was the only man in her life.
Then out of the blue (no pun intended), her "boyfriend's" back, whom she loved (despite what she told Richard at the house to stop him asking her about Superman) deeply and who left her alone for five years.
I think Lois's line above was more to try and gain back some equilibrium, because Superman was taking her flying, and she--stubborn woman that Lois Lane is--was sticking to her guns about Richard at the time.
Superman's reply was merely an observation about the difference between Richard's flying capabilities and his--I didn't hear anything malicious in it at all.
either Lois is a liar who's using Richard, or she's just really passive after finding out Jason is Superman's son, which is so far OOC for her that no fanwank could make me accept it. I would expect her to confront him and slap him. Hard. Not let him get away with that "I'm always around" crap.
I don't think she was either. I think she's still confused, and she, Richard, and Superman have a lot of issues to work out.
But I do think, from his "speech" to the sleeping Jason, that Superman will at least want to be around--specifically around Lois's house and Jason--more often, now that he knows he's a father. I caught quite a bit of awe in Superman's delivery of that speech (which, granted, was copied from Jor-El's speech to him, but didn't lose any emotion in the re-telling), like he was awed to be a father, that he actually had a SON . . . someone LIVING who he could call his own flesh and blood.
And now, since we're definitely getting a sequel to SR, we'll be able to see what goes on in that regard too.