I think whether to keep yr ex photo or not must also depend on
the reason of the break-up! If yr ex cheat u,being unfaithful,hurt
u by beating u up,being super possesive,always threaten u this and
that. Then I think it is something wrong of u to keep yr ex photo
who u still have a fond memories of him or her?
But in another way round,if u break becos of parent
objection,misunderstanding and damaging reason but he/she treat u
super good during yr r/s period. I personally think keeping of ex
photo to remind of the past memories is valid!