When you leave a relationship alone for awhile and then you either both meet and agree that it is over or you are dumped and really don't care since you haven't seen the other person in so long anyway.
John was dating Naomi but didn't see or talk to her so the relationship went out of date when they ran into each other last week after two months apart.
The fear or condescension of programs and other operating information used by a computer which are not kept up to date, especially if the updates are freely accessible for the hardware currently in possession. From the Greek "phobos" meaning fear and the English "outdated" and "software" meaning outdated and software respectively.
Why are you still on macOS Sierra when High Sierra is fully baked‽ You trigger my outdatedsoftwarephobia!