don't be a stranger
US /doʊnt bi ə ˈstreɪn.dʒər/
UK /doʊnt bi ə ˈstreɪn.dʒər/

1.
また連絡してね, 連絡を絶たないで
used to tell someone you want them to stay in contact with you
:
•
It was great seeing you! Don't be a stranger.
会えてよかった!また連絡してね。
•
We should catch up again soon, so don't be a stranger!
近いうちにまた会おうね、連絡してね!