Over a period of years, our minds, like our lives, builds up clutter which unless cleaned out, results in the inability to process thoughts outside our everyday, domestic, ones. Part of that clutter could be stubbornness to release what doesn't serve you well. Is there someone you'd like to reconcile with, but your ego is standing in the way of making the first move of "forgiveness?" Why? Years travel by so quickly and time really does not stand still for any of us, so why not offer the proverbial olive branch to that person or people, who hurt you?
Clean out that clutter! Even if you "forgive" and they don't reciprocate back, you have released such a weight of negativity, and you will feel better. So, drop the ego, lose the stubbornness, and reconcile with your friend, your family, your pet. just do it! You may be pleasantly surprised at the outcome. Friendships are not suppose to wither away and die, before it's to late, give "forgiveness."