So unless you’re Buddha or some other special individual who reaches Nirvāna: the ultimate resting place and end of the cycle of death and rebirth, death is simply not the end. Just a break. A change of scene in the longest and most riveting movie imaginable.
It’s a lovely idea. It means that anybody that you have lost, if you decide to subscribe to the Buddhist way of thinking, is not forever lost. Just repackaged and redistributed. To share the wealth so to speak.
And better still. If you really loved them, and they left a huge impression on you for the better, then you can be assured that the merit that they accrued from that alone has helped in securing for them a better life the next time around. They are better for having known you. And you’re better for the time that you had with them. And on it goes.
So take your pick: “Rest in Peace” or “Live on, better and better again”