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Нет, оба предложения неправильные.
Правильно: Я увидел мужчину, который был с девочкой.
Я увидел мужчину, с которым была девочка.
Я вижу (видел, увидел) мужчину с девочкой.
(Девочка тоже...

"I saw the man which is with the girl" is not grammatical.
Firstly, I don't think you can use 'which' with people.
"I saw the man who is the with girl"

In which case in Russian it would be:
Я...

In the US and Australia and NZ a thong can also be flip-flops.

They don't have dumpsters in NZ. Just sheep.

Basically the guy needs to learn to speak English properly first.