Sure ka na ba?
Kung oo, dapat alam mo kung kailan ka naging sigurado.
If matagal na, most likely ramdam na rin yan ng partner mo and may idea na siya.
Kung recently lang, mahirap i-justify.
You may wanna ask yourself first, "what changed?"
Kasi kung hindi mo rin alam ang reason, you'll definitely have a hard time letting the person know.
Just remember, everyone deserves a decent closure.