Let say for one reason or another, we have friends whom we've drifted apart from in our lives, and they also happen to be Christians. We're all going to meet each other in Heaven, but does the Bible say anything about our unresolved tensions and how we'll see each other from then on?
This is in the realm of speculation, but for sure any Christian in heaven has already been sanctified completely so assuming that we and our friends "make it to the end" and enter heaven, there will be so much goodwill and catching up and learning of why we drifted apart on earth but then immediately forgive each other then focus our attention to have eternal great fellowship while enjoying the presence of God that all causes for drifting apart on earth would have vanished into insignificance.
I use to have "anxiety" and still do (at times) as to how can I have joy and peace in heaven when I know that here on earth some of my friends and loved one's have died without knowing Jesus Christ.
Then the Lord gave me Revelation 21:4-5, "and He shall wipe away every tear from their eyes; and there shall no longer be any death; there shall no longer be any mourning/sorrow, or crying, or pain; the first things have passed away."
Verse 5, "And He who sits on the throne said, "Behold I AM MAKING ALL THINGS NEW. And He said, Write, for these words are faithful and true." When "glory" comes, all I want to see is "smiles" and "rejoicing." Hope this helps!