When you have a real loving relationship with someone, you collect so many memories, photographs, items, etc. that you happen on later on in life at random times and no matter how long it has been, they will just stop you in your tracks.
30 years from now a special song will throw up memories. Or you will find something in the back of a drawer. It doesn’t matter how long it has been. It just doesn’t hurt as much as it used to and doesn’t cause you to feel depressed for the rest of the day.
When it is fresh, one thing can ruin your whole day. But after time, it is more of a numb feeling where the feeling comes, you understand it, and then it passes and you go on.