Max does screw around, hell he's got three pregnant women with him. The petra thing is just a damaged girl finding herself again, getting her self confidence back, she's bound to step over the line now and again, remember Amy did as well. And don't forget Max, he promised to talk to them about how he's feeling and he's not, so Emma can be forgiven for not knowing what he's thinking all the time. This is just the crap that couples go through, say something insensitive, get snapped at, feel bad, then appologize...having everything all roses and sunshine would be nice, but its not beleivable.