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Source: https://writers.stackexchange.com/a/35465
License name: CC BY-SA 3.0
License URL: https://creativecommons.org/licenses/by-sa/3.0/

Source: https://writers.stackexchange.com/a/35465
License name: CC BY-SA 3.0
License URL: https://creativecommons.org/licenses/by-sa/3.0/

If the argument is a minor one, and the characters are people you'd expect to generally get along (good friends, parent/child etc.), you can safely skip the making up. In long-term relationships of any sort, it is natural that minor arguments occur, and then get resolved. It's not a big issue, it might as well get resolved off-screen. If resolving the argument adds nothing to the story, it definitely should be resolved off-screen. A reader would assume that they argued, someone apologised, or just forgave, no big deal.

If, on the other hand, the argument was over a major issue, or one of the people arguing crossed a line with what he said or did, the apology cannot be just assumed.  
For example, a very disappointing instance in _Star Trek - Deep Space 9_ was in season 6: at the start of the season, one of the main characters cheats on his girlfriend, abandoned his duties, and allowed the Bad Guys to do a series of Bad Things. Eventually he remembers what he should be doing and saves the day, but then the reconciliation happens off-screen. Literally: the character and his girlfriend go into a closed room, and next time we see them, they emerge reconciled. The viewers hated it, the actors hated it. It only happened because the writers first wrote the character's temporary betrayal, and then couldn't figure out what to do next. Since you're not writing a TV show, you can do better.

Original score: 4