2 added 6 characters in body
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I found the answer:

But we use personal pronouns, not reflexives, after prepositions of place... Source

He had a suitcase beside him.He had a suitcase beside him.

and after with when it means "accompanied by":

She had a few friends with her.She had a few friends with her.

After a preposition of place or location we use a personal pronoun and not a reflexive pronoun. Source

He put the backpack next to him.He put the backpack next to him.

I found the answer:

But we use personal pronouns, not reflexives, after prepositions of place... Source

He had a suitcase beside him.

and after with when it means "accompanied by":

She had a few friends with her.

After a preposition of place or location we use a personal pronoun and not a reflexive pronoun. Source

He put the backpack next to him.

I found the answer:

But we use personal pronouns, not reflexives, after prepositions of place... Source

He had a suitcase beside him.

and after with when it means "accompanied by":

She had a few friends with her.

After a preposition of place or location we use a personal pronoun and not a reflexive pronoun. Source

He put the backpack next to him.

1
source | link

I found the answer:

But we use personal pronouns, not reflexives, after prepositions of place... Source

He had a suitcase beside him.

and after with when it means "accompanied by":

She had a few friends with her.

After a preposition of place or location we use a personal pronoun and not a reflexive pronoun. Source

He put the backpack next to him.