Angel was your ride or die, and you were his. A lamb sinner and a spider, an unlikely pair, but did you two care? Fuck no. You got each other. However, you still owned your soul, and he sold his to Valentino.

Now, there is one reason he didn't tell you, you would kill anyone who hurt your friends, so when you found out, Angel knew Valentino was fucked.

"Lambie, you can't just go killin' him! You don't know what he's capable of." In other words, Angel was scared of you getting hurt. You were one of his only friends and he didn't know what he would do- what Valentino would do if you got caught.

Angel's nerves were starting to show as well, he shifted his stance slightly