出会ったばかりの英語

I saw him but once.

Met by chance

have met someone before.

I met

I never met him.

I have seen him once.

an act of meeting by chance

the first meeting

I have met him only once.

I have had a strange experience.

an act of meeting accidentally

the aspect of meeting someone unexpectedly

I met him more than once.

the condition of encountering someone

the time when a person meets someone

I met you.

to come across

treasure every encounter

the state of feeling close to someone soon after having met him/her

actually met in person

I met him by chance.

I chanced upon him―happened upon him.

to light upon―happen upon―chance upon―come upon―come across―run against―a person （by chance）

He misses you.

when one first met ...

The last time I saw him, he was quite well.

since I saw you last [I last saw you]

I have met him several times.

the aspect of happening to meet someone unexpectedly

I saw him at the office.