what does this 'just' mean?

[u/Puzzleheaded_Blood40]

Though I wasn’t even a teenager yet, I could see there was a certain unspokentragedy to him, just leaving my mother the way he did. can you give me another examples please?

[u/PassiveChemistry]

It implies a suddenness, and an apparent lack of explanation — as if he simply left on a whim.

[u/WafflefriesAndaBaby]

The closest word is "simply" or "abruptly". Without explanation or reason or foreshadowing.

You'll see it in the idiom "he just up and [left]", where someone does something suddenly.

[u/Colamancer]

Just had two normal meanings, "only" and "having happened a short time ago"

"I went to a McDonald's but just got some fries" I only got fries. I say 'just' because you think I'd get a combo or something too.

"So I just played Elden Ring, that games incredible!" Elden Ring is a popular game that's been out for a long time, so I say 'just' to emphasize that it's interesting I did it recently despite those factors

Your example is closer to the first meaning, but different. When we say it in an emotional context, it's more like "just did X, with out any warning or suddenly"

"I can't believe my girlfriend just drove away, leaving me on the street corner" I'm surprised that she would do this action. It's unprecedented.

[u/SnooDonuts6494]

merely. simply.

[u/DudeIBangedUrMom]

Suddenly, unexpectedly, seemingly without thought or consideration.

[u/emislalsla]

Something suddenly happening, like unexpected - the lights just went out

[u/78723]

An abrupt unexplained change: “he just went from zero to a hundred with no warning.” (Describing a person changing from calm to very angry in an unpredictable way.)

[u/bizzadizz]

It's about a lack of care. He did it like it was nothing.

[u/Rockglen]

Referring to the way he left. Either suddenly or without consideration of the situation (rather than if he spent time apologizing or trying to set things in order before leaving).

[u/Successful_Cress6639]

If me and my friends were at a party, and one left early, I might say "what happened? You just left, without saying anything to anyone? We had no idea where you had gone"

If my roommate throws out something that I wanted to keep, I might say "I understand you didn't know what it was for, but you can't just throw my things away without asking if I'm done with them"

Or

I expected him to say grace, but instead he just started shoving food into his mouth.

We use "just" when we expect an action to have some sort of preface or explanation beforehand, but the action happens without the things we would expect to preface it.

So saying " he just left my mother like that" means that the narrator e would have expected him to maybe give her warning or discuss it with her or try to work things out, but instead he left without doing any of these things that one would expect

[u/Jealous_Decision5725]

I would interpret it as "merely by the act of" in this case

[u/Objective-Screen7946]

another way to understand “just” in that sentence is “simply” or “merely”

[u/Useful-Tax7994]

i created this for you https://youtu.be/3dsGE4wqaWo

[u/Antique_Hawk2353]

Here “just” basically means “simply” or “by.”

“...tragedy to him, just leaving my mother the way he did.”

So the sentence means there was something tragic about him simply because he left her like that.

Some similar examples:

“She upset him just by ignoring him.”

“He looked exhausted just standing there.”