It’s entirely possible (and likely) that he still does care about you and needs space right now, but that doesn’t mean you can or should wait around for the potential of him coming back. Definitely cut contact w him for the moment, it’s hard, but you can always reevaluate whether you want to reconnect w him at a later date, once you’re fully over him in a romantic way.
Just bc he’s out w a girl doesn’t mean they’re dating and it doesn’t say anything about how much he cared about you when you were together. Having said that, definitely block or delete him for the time being so you can’t see his social media. Take care yourself and try to distract yourself for the time being. It will get better!!