Walt keeps pushing and he keeps finding out that he can only get away with so much. Gus has his own agenda on 'Breaking Bad' (Sun., 10PM ET on AMC), and as important as Walt is to the drug empire he's built, he's not going to allow Walt any more leverage over him than he must.
Gus is cold in a way that Walt can't comprehend, though he tried to put on a show of how tough he could be for Skyler. All that did was drive her away, and when she came back, she put him right back in his place ... beneath her heel.
Meanwhile, Jesse is apparently genuinely impressing Gus now, which will only further drive the wedge between Jesse and Walt. Of course, this was Gus' only intention in the beginning, but now it looks like he may be coming to see Jesse as someone who could genuinely be of value to his organization on his own.