“The Challenge” star Davis Mallory hard-launched his romance with his girlfriend a year after announcing he was no longer gay. The former reality star recently took to Instagram to share a collage of special moments he spent with his girlfriend, Rachel Vaughan, on vacation. “Thankful for new memories that someday turn to old photographs,” he captioned the post. In a second Instagram post, Mallory, 43, packed on the PDA during their romantic getaway, sharing a kiss for their selfie. “It’s crazy what love can do. I love you @rachelevaughanaa,” he captioned the post. Mallory told TMZ that he and Vaughan first met in February 2022 while he was…