Cassie Randolph apparently no longer feels threatened by her ex Colton Underwood ... 'cause she dropped the restraining order against him ... in fact, she's dropped everything.
Sources with direct knowledge tell TMZ ... Cassie dismissed the restraining order with prejudice, meaning she can't refile it. We're also told the police investigation is being dropped -- per her request.
Colton tells TMZ, "The two of us were able to reach a private agreement to address any of Cassie’s concerns. I do not believe Cassie did anything wrong in filing for the restraining orders and also believe she acted in good faith.