Halo by Alexandra Adornetto

Three angels – Gabriel, the warrior; Ivy, the healer; and Bethany, the youngest and most human – are sent by Heaven to bring good to a world falling under the influence of darkness. They must work hard to conceal their luminous glow, superhuman powers, and, most dangerous of all, their wings, all the while avoiding all human attachments.
Then Bethany meets Xavier Woods, and neither of them is able to resist the attraction between them. Gabriel and Ivy do everything in their power to intervene, but the bond between Xavier and Bethany seems too strong. Then comes the brooding and popular new transfer, Jake Thorn... who just so happens to be in Bethany's class. Something about Jake seems to be hiding something darker, something more powerful than expected. That thing, and Xavier, distracts Bethany to a point that Gabriel and Ivy are concerned.
The angel’s mission is urgent, and dark forces are threatening. Will love ruin Bethany or save her?