There is one solution to be offered for your problems. The solution requires absolute sincerity and concentration. You cannot fake the solution, even to fool other people, because the solution is for your own peace of mind, which cannot be fixed if you fake it. You must forgive. If someone is annoying, accept them in your heart. If someone broke your heart, except their apology and do not hold anger towards them. If someone stabbed you in the back, forgive them, and move on.
Here's the catch, if you forgive, this does not mean everything has to go back to the way it was before, and in fact, it most likely will not. The solution entails that in your hearts there is no hate/anger/jealousy/hurt on either side, and you can act like civil human beings without any awkward moments.
But, if you are the author of the crime, do not expect immediate forgiveness. You most likely will not get it, unless it's for something petty. Give them their space, and let them come to you with a clear heart.
Behind forgiveness is the promise of a clear, unburdened heart. A true one. Not one that requires covering up, but one that can float away into the sky, carried by love, because their is no hate to hold it down.