^I'm not too sure, to be honest, having only played ToS twice.
Hell, I'm not sure what endings I got.
Spoiler Below From what I gather, "Can I trust you?" happens when Kratos likes you more then Zelos does: thus Zelos will fight you and die. "I trust you." happens when Zelos likes you more then Kratos does, thus he'll live.
I just realized how badass Regal and Presea are. Presea's axe speaks for it's self, Regal is just awesome.