I would like that the user who completed the form can share the answers to his questions with a link, and anyone with that link can see the answers. Is it possible?
This isn't a built-in feature of Google Forms. It's possible that there are Google Forms Add-ons that does this.
By using Google Apps Script we could get the edit response URL but there isn't a "view response URL".
One alternative is to copy the responses out of Google Forms, like using Google Documents, then sharing the corresponding document.
A hacky alternative is to add a required "edit authorization code" (secret code) question having an answer validation after that all responses were got. Then send the corresponding edit response URL to each respondent. In order to edit the responses they should know the "secret code"
NOTE: Google used to block forms having questions for passwords, so don't use Password instead of "secret code"