It’s not easy but swallow your pride and make things right with anyone you can who you think things may not be right between you. I mean, what if there was a God who would eventually judge the whole world based on what He told them and what if part of that was about how we forgive each other and if we do our part to live in harmony with each other...Oh, wait a minute (Ephesians 4:32; Colossians 3:13; Matthew 18:15-35; Matthew 5:21-26; Matthew 22:32-40; Romans 12:18; 1 Corinthians 1:10; 1 John 4:20; John 11:35; 1 Peter 1:22). Kind of amazing how many of us think it’s OK to harbor past hurts, to easily excuse flimsy “efforts” at making things right when we are at odds with someone, to be so mad at someone we won’t speak to them or our blood boils when we even see them, to sit int he same building and believe they are offering worship to the same God but to inwardly hate another, to not be involved in some good work for God because of who else is involved in it, to talk bad about, gossip about and wish ill will toward others.
I don’t care how long it’s been or who’s involved - YOU are going to stand before God some day - I think I’d be doing my best to make things right with others! And the good news is, you'll find more rewards in it than just one.