OUT OF SIGHT, OUT OF MIND!!!
The idea that something is easily forgotten or dismissed as unimportant if it is not in our direct view.
If you do not see someone or something frequently, you will forget about it. (Sometimes used to imply that you will forget about people who have moved away.)
The use of ‘in mind’ for ‘remembered’ and ‘out of mind’ for ‘forgotten’ date back to the at least the 13th century. The earliest printed citation of a link with memory and the sight of something is in John Heywood’s Woorkes. A dialogue conteynyng prouerbes and epigrammes, 1562, as reprinted by the Spenser Society, 1867:
“Out of sight out of minde.”