Get with someone/Get together (with someone) = Start a romantic relationship with someone
(Transitive & Intransitive)(Inseparable)
Examples:
“Have you been together long?” “Yeah, we got together a long time ago”
_________
“You and that girl have been flirting for a long time, I think you’re going to get together!”
_________
“You bastard! You got with my best friend!?”
_________
"Did you get with anyone on new years eve?"