付き合っている

be dating; associate with

→ 付き合う
phrase Uncommon #11,593
be dating; associate with Can refer to being in a romantic relationship or spending time with someone socially, depending on context. The particle と commonly marks the person involved.
JA: 最近、友達とよく付き合っている。
EN: Recently, I’ve been spending a lot of time with my friends.

人は付き合っているによって変わる

People change depending on who they spend time with.

付き合っている人はいますか

Are you seeing anyone?

ウィンとは長く付き合っているその間一度別れたこともあった

I've been with Win for a long time, though we did break up once during that time.

— ブエノスアイレス (1997)

人は付き合っている人間わかる

You can tell what a person is like by the company they keep.

彼はクラスメート全員上手く付き合っている

He gets along well with all his classmates.

木村さんと友達として付き合っているだけです

I'm only friends with Kimura-san.