Your past is your past, you should be over it.
Even if it’s good, it’s just past.
It’s non-existent.

What exists is the right now.

I am a bit of melancholy-type. I love thinking about the past, remembering the old times, see how people grew, and so on.
I realize this is not always healthy, mostly because the past, as the future, is an image. Time that cannot be spent in the present.
Yes, the past did exist (while the future is not yet real), but it doesn’t exist right now.

I guess we all have to find a compromise between the love for what we have and the love for what we had.