@TMaxOften, language, between characters, also evolves over time. So when first meeting, their phrasing will be a bit strained, terrified of saying the wrong thing, and if things go well, they'll begin opening up, mainly hinting at things indirectly, to see how the other responds, particularly about previous relationships or, in a job setting, about their responsibilities in that previous job, as everyone begins working towards their new promotion shortly after getting each new one (self-promotion).
Likewise, relationships should begin slowly, building as the relationship progresses. Yet if someone has experience, they'll often sweep the other off their feet, and help move the relationship along, saving your romances from beginning so stiflingly slow.
Yet, save any major revelations for later, so they'll have more of an impact, so treat them as just that, 'revelations', where they recall those events in their early life which affected their attitudes going forward, predicating who they hope to become in the future.
Since fiction IS conflict, make such revelations dramatic, starting first with silence and avoidance, dancing around the topic, before getting them alone, softening them up, and giving them the old 'We need to talk' line that everyone fears. Only here, they use it to initially distract and then reward, as they lead into their innermost secrets (potential open relationship, running off to get married rather than a big expensive wedding, or just reveling a wilder, more impulsive tendency).
Also, as I've always advised, no one wants to read "how people ordinarily speak". That has its uses, yet just as reports cut the first three introductory paragraphs of a story, to get to 'good stuff', first, then backing up to reveal the specific details. Treat your dialogue the same way.
Skip that whole "Hey, how're the wife and kids", boring crap and start mid-dialogue, when someone reveals what they were waiting to announce to everyone. THEN, as everyone starts shouting questions, they too back up, supplying the precise details.
That way, you set the stage for the information, before they lay it out, setting the readers' expectations, rather than treating it like a 'regular', boring competition.
Because, in fiction, a dialogue is never just a dialogue, it's an introductory transition, either summarizing what transpired between scenes, OR it's introducing a new start of upcoming affairs. So treat it dramatically OR briefly summarize it to gracefully move beyond it.
But that's my $12 and 23ยข.