like ships that pass in the night
US /laɪk ʃɪps ðæt pæs ɪn ðə naɪt/
UK /laɪk ʃɪps ðæt pæs ɪn ðə naɪt/

1.
two people who meet for a short time and then separate, often without getting to know each other well
:
•
We were like ships that pass in the night, meeting briefly at the conference and never seeing each other again.
•
Despite living in the same city, our schedules were so different that we were always like ships that pass in the night.