Hooking up with Kourtney Kardashian, 36, was probably fun, but Justin Bieber, 21, is ready for more — and it looks like he’s getting it from longtime friend and on-off love interest, Hailey Baldwin, 19. Here’s why Bieber is finally ready to take things to the next level with Hails!

justin-bieber-hailey-baldwin-vacation-3“He has been friends with her for a long time and he can trust her,” an insider says. “These other girls are nothing more than a good time — that includes Kourtney. He was never going to settle with Kourtney or these other girls because they have baggage. Hailey has proven herself to be someone he can trust, who he’s attracted to and has a lot of fun with. In his mind, it really is worth a shot to see if things work out.” To hear more about Kourtney and Justin, head over to iTunes and download the latest HollywoodLife podcast for free!

Fans speculated that Justin and Hailey had turned into more than friends during their post-Christmas vacation to Anguilla with his family, and the 21-year-old seemingly confirmed the rumors with an Instagram post on Jan. 3, in which he’s passionately kissing the gorgeous model during their trip. And, as we previously reported, Kourtney is dunzo with her much-younger man after seeing things heat up between him and Hailey!

“She’s seriously considering whether she’s going to continue seeing him or not,” an insider explained. “She thought it wouldn’t bother her, but deep down, it does. It’s just a wake-up call that her romance with Justin would never evolve into anything serious.” And she proved just that by reuniting with ex, Scott Disick, and their kids for a family date on the very same day the Biebs shared this scandalous photo!