Mind is all weird it thinks the most which is forbidden almost deleted stuff from one’s memory. While you never voluntarily decide to bring that one person in your thought process again and one simple external object or anything that triggers the mind and brings back the forgotten memory of that person whom you left behind. Just to distract your thinking you think that person must be okay and happy without you. It’s so difficult at times to even manipulate your mind for that to no longer waste your time in recalling those happy past memories with that person.
It’s strange how we souls meet for few days and then never care whom we met, then why we actually meet in the first place ?
Universe is mysterious and more the one who made it.