iceis

I just finished reading Masca and I started getting really confused at the end...these are some of the question I can't seem to find an answer to...could anyone please clue me in haha. The first question is: why does Kainen lose his immortality when it comes to love? and why does Kainen say you are born immortal but Gatmiel says you must kill the parent to become immortal? and is Gatmiel half Belial? and why in the sequal to Masca does it have Rakin say he is no longer immortal? Help Please!!!