The best replacement for break up is stay together.

The best alternatives to break up are rated as following:
★★★★★  stay together
★★★  get married
★★★  make up
★★  take a break
★★  break down
★  breakup
★  broke up
★  long distance
★  break up
★  get engaged
★  taking a break
★  separation
★  keep trying
★  break off
  move in together
  work it out
  realtree ap
  break
  hook up
  fix it
  not to break up

Your alternative for break up is not listed? Suggest!
Speaking about break up, one probably shouldn't forget about live in boyfriend.

Other search terms related to break up and their ratings are:
★★★★★ live in boyfriend
You have in mind a companion for break up and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of break up in all years. Click on graph for more.
break up
stay together
get married