He looked and acted creepy. I was surprised that Maggie chose to go with him after their second encounter at the library. He could have been a stalker, serial killer. The questions he asked her certainly would raise the suspicion that there was something abnormal about him.
For her to be throwing herself at him on the third encounter, to a creepy man, she must have had a death wish. For her to be falling for a creepy man that she hardly knew; my cynicism of 'love' grew deeper. He looked even more creepy, like an escaped mental patient when he became human and ran around, shoe-less,looking for Maggie.
From his encounter with Nathaniel he also seemed to be a rookie angel too as he was unaware of things about angels. Then for him to give up a heavenly existence for a temporal earthly existence, especially the fallible human love, he certainly was an angel that had lost his marbles. The grass certainly looked greener on the other side, until you cross over.
Crappy ending. The author could have made a better one to get his messaage across.