I think Cam would have stuck around instead, partly because John asked him to keep an eye out for Evan, and that's a pretty bug thing for John to do, so he feels like he owes John, and partly because Evan looks exhausted and depressed, and Cam's worried about him.
And then it could go two ways. Either Cam eventually manages to get through to Evan and shake him out of it a bit (possibly with help from Laura, because she'd call back to make sure Evan was okay, and he'd mention that Cam kept coming by, and she'd bully him into actually interacting with another person). Or Evan hides away and stops answering the door to him, and ends up either not going back to Atlantis or going back and getting into something destructive, depending on how far you want to go into actual depression or post traumatic streess, and how much you think John would be able to fix things without Cam to help.
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And then it could go two ways. Either Cam eventually manages to get through to Evan and shake him out of it a bit (possibly with help from Laura, because she'd call back to make sure Evan was okay, and he'd mention that Cam kept coming by, and she'd bully him into actually interacting with another person). Or Evan hides away and stops answering the door to him, and ends up either not going back to Atlantis or going back and getting into something destructive, depending on how far you want to go into actual depression or post traumatic streess, and how much you think John would be able to fix things without Cam to help.