The pronouns si and co are reflexive and, for this reason, refer to the subject of the sentence, for example:
Maria like to praise yes. The pronoun “si” refers to the subject “Mary”.
Maria like to talk I can. The pronoun “consigo” refers to the subject “Maria”.
It is common to use the words "own, even (a)" together with you and yourself to reinforce the idea of the reflexive pronoun, which relates to a subject who does and suffers the action:
Maria likes to compliment herself. Maria likes to talk to herself.
It is incorrect to use "you" and "with you" without being reflective, as in:
I want to talk to you. (There isn't a guy who practices and suffers the action, so he's wrong.)
The right thing is: I want to talk to you.
The pronoun “with you” is not reflexive, as well as “with us” and “with you”. Therefore, they can be used in the following way: “I want to talk to you.”, “Leave it to me”, “The Lord is with you”.
Observation: In Portugal, the use of “you” and “with you” is acceptable.
By Sabrina Vilarinho
Graduated in Letters
Brazil School Team
Source: Brazil School - https://brasilescola.uol.com.br/gramatica/o-uso-consigocontigo.htm