彼と知り合って

met him

→ 彼
phrase Rare #27,536
met him 知り合って is the te-form of 知り合う, meaning “to meet” or “to get to know.” It can connect to what follows, or be used with から to mean “since meeting him.”
JA: 彼と知り合って、すぐに仲良くなりました。
EN: I got to know him, and we quickly became friends.

私は彼と知り合って長い。

I've known him for a long time.

彼と知り合ってもう長いのですか。

Have you known him for a long time?

彼と知り合って一年ほどになる。

It's been about a year since I met him.

彼と知り合ってから二年になります。

It's been two years since I met him.