As a result of Terri and Olivia Greer changing the time-line for Buck, the boy never skipped classes at high school and never stole from stores. However, even the Elders couldn't change what Buck had inherited from his father - a skill for charming any female he spoke to, and he started dating females without ever having proper relationships with them. Once the Elders were sure that Olivia had helped change Buck so that he would one day fulfill his part of the prophecy, they recalled Olivia (who'd had to keep changing her appearance to remain the same age as Buck) and she said a tearful farewell to her friend. Buck had never gone on a date with Olivia, fearing that if they got too close, she'd have to leave him again like the first time they'd been friends; instead, Buck only occasionally spent time with the girl. When the two parted, Buck wasn't too surprised, as he had always thought they'd part again one day, and he had learnt by then that there were plenty more females in the world for him besides Olivia.
Renard never recruited Angelica in the changed time-line because he couldn't bear the thought of another female warlock failing miserably to get to the prophesied and bound witch. Numerous male warlocks were sent by him to get to Buck, but they all failed because either Olivia or another Whitelighter was always protecting him - the Elders had learnt from their mistake of leaving the bound witch unprotected. Renard eventually got summoned then vanquished by none other than Charles Wilmington, Buck's father. The good witch never found out that Renard was responsible for all the attempted attacks on his son.
No-one on the side of good except the Elders, Olivia and Terri, remembered what had happened to Buck before the time-line had been altered, meaning that the Wilmingtons didn't have the painful memories of their son being attacked by a warlock anymore.
So, because of the Greer Whitelighters' efforts, Buck eventually fulfilled his destiny along with the other five witches and their Whitelighter, unfortunately losing his mother and father along the way - but that's another story.
The End
If you enjoyed this, I suggest you read "The Seventh Brother" where the guys are all adults (if you haven't already). However, I must warn you that some of the story you've just been reading will spoil a few surprises in that one.