I (Jackie again) have a problem with this. It's not that I want to, or that I even realize it most of the time, but I tend to hold some minor grudges.
When I see people that have rejected me in some way (there are three in particular on campus who I tend to do this the most to), I do my best to look like I'm so happy and having the time of my life without them. If I know I might run into these people, I make sure I look at least decent and that I'm smiling and laughing with my friends. If I somehow end up in their line of sight and I'm alone, I hope they don't notice me and pretend to text on my phone so they don't think I'm a loser (After writing that down, I sound so incredibly petty...yikes).
My point is, grudges are not good for you. They eat you up inside, and you become obsessed with proving yourself to a person you probably shouldn't care about and may not ever have to deal with again in your life. You're only hurting yourself because the person you're holding a grudge against may not even care.
"Be kind and compassionate to one another, forgiving each other, just as Christ God forgave you." Ephesians 4:32