While Hayden Panettiere was able to overcome her addiction battle with alcohol and opioids, an insider claimed she’s yet to let go of on-off ex Brian Hickerson. According to a source, the pair quietly rekindled things at some point despite the allegations he was abusive toward her. The source added that they even spent the December 2023 holidays together with his family in South Carolina. “Brian and Hayden truly never broke up and really just [laid] low in the months after his arrest [for domestic battery] and her public declarations of healing herself,” the source spilled to a magazine, refer…