Let's say u went to Europe for a holiday 20 years ago, can you erase the memory or not?

Of course cannot erase....

Why bother to erase...?

Just live with it.

It's just how you want to deal with the memory. It's you who decide to think of it all the time.

Do you think of your past holidays all the time? No, right?

To solve the problem, just find another girl lor...eventually you will not think about her (ex gf) anymore.