About
Castiel is an Angel of Heaven, who manifested on Earth inside his Vessel, Jimmy Novak.Many angels laid siege to Hell to rescue Dean, but it was Castiel who ultimately pulled Dean out. According to Castiel, he did so "because God commanded it". His hand print was burned into Dean's left shoulder.
Castiel is amongst a group of angels who manifest on Earth to stop the breaking of the The 66 Seals which will release Lucifer and start the Apocalypse. Over time he develops an empathy for the Winchesters, in particular Dean. When he learns that Michael actually intends for Lucifer to be released so he can kill him, Castiel tries to warn Dean, but is punished. Ultimately he breaks allegiance with Heaven to side with humanity.
With Lucifer free, and Castiel cut off from Heaven's power, he decides to try and find the long absent God. When he learns God is not interested in intervening to stop the Apocalypse, he is devestated. He works to support the efforts of Sam, Dean and Bobby in stoppping the battle between Michael and Lucifer.
After Sam's sacrifice to defeat of Lucifer, Castiel tries to rescue him from Lucifer's Cage, but fails to retreive Sam's soul. In an attempt to prevent Raphael from restarting the Apocalypse, Castiel is tempted into an alliance with Crowley. The demon offers to help find Purgatory which can provide them both with great power. His efforts mean Castiel becomes increasingly distanced from the Winchesters as he hides his efforts from them.
After taking in the souls of Purgatory, Castiel defeats Raphael. He claims that he is no longer an angel, but the new "God". After smiting many people he considered to be doing evil in God's name, he blacks out and loses control of his vessel, and his powers, to Leviathans possessing him. Conceding to Dean and Sam's wishes, Castiel attempts to return all the souls and entities inside him to Purgatory.
After the souls leave Castiel, he apologizes to Dean, and pledges to find some way of redeeming himself. His plans are cut short when the Leviathans, who managed to hold on, take over his vessel. As the vessel rapidly deteriorates, the Leviathans march it into a reservoir, where it disappears beneath the water, releasing them. Castiel's Trench Coat washes up on the shore, and Dean tenderly retrieves it and takes it with him

Forever in my heart.
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"No, it's..it's cool. I don't mind the ramble..." He smiles gently. If anything he missed Cas's voice, his everything. The last thing Dean needs to think about is the 'pizza man' and 'hooking up' while he's in a very close proximity of one handsome angel. Dean can admit that Cas is handsome, even when he's covered in blood and dirt. In fact it kind of makes him look hotter. Then again, that's just Dean. If someone stepped into a room and went all BAMF on a few hundred demons then walked up to him covered in blood and sulfur, he'd be all over that person in a second. To Dean, Cas is much more than that. Admittedly, he's so much more that it's hard to for him to even make those kind of moves. Cas deserves a whole lot better. When his friend his beaten and broken, just looking for a place to crash and call home; Dean can't find it in himself to make any moves. What kind of friend takes advantage like that? Besides, being more than friends, that's probably the farthest thing from Cas's mind. Dean blinks and blinks again, Where did he learn that? Oh..right from him. " Uh no, no no no no. I didn't mean it like that..." He laughs nervously. "I meant uh, giving you the things you need to make you feel like it's yours to? Y'know, we can add some things you like to your room ..uh pictures, a few chairs..a tv or whatever you like."
https://www.youtube.com/watch?v=3H21fj0hQRM
Here maybe this made me feel better after mine <3
Eh, don't worry about me Cas!
Everything is perfectly fine!