Jason Tartick and TikTok star Kat Stickler have been spotted smooching at a Post Malone concert, an eyewitness has revealed. The Bachelor star haven’t quite made their romance IG-official, though… The Bachelor contestant called off his engagement to Kaitlyn Bristowe in 2023, months before he sparked romance speculation with Kat Stickler earlier this month. And it seems the two are very cosy. Jason Tartick and Kat SticklerJason Tartick and Kat Stickler were spotted smooching at the Stagecoach event, as he held hands with the TikTok star as they watched a Post Malone concert. They were “very cut…