'Making a Murderer' Ex-Fiancee Says Good For Brendan ... But Don't Let Steven Out!

Steven Avery's ex-fiancee, Jodi Stachowski, is glad Brendan Dassey may be finally getting out of prison... but she's terrified it could lead to the release of her ex.

Jodi tells us ... Brendan's impending freedom could put pressure on the courts to release Steven, who she firmly believes is guilty of raping and killing Teresa Halbach. She says she fears Steven, whom she not only believes is capable of murder ... he's already tasted blood.

Jodi has great sympathy for Brendan and believes the State of Wisconsin has a duty to take care of him because they willfully destroyed his life.

Steven Avery's brother, Chuck, has a different view. He tells us he won't celebrate until the other person wrongly convicted is also freed ... his brother.