Emotionally attached to an ex

Be
How do you get over your ex that tou are emotionally attached to?? I tell myself that I don't love him that way anymore but I've heard about him and his supposed new girl and I can't help but feel... I suppose "eh" about it. I'm talking to a guy myself atm but it's just that I was in love with my ex for so long and he was too and it's just so weird for me to not be talking to him and to see him with a potential girlfriend. I feel like I don't want to date him again but we had such good memories and I'm afraid that I'll never have that connection with someone again, not even with the guy that I'm talking to atm. I don't know what to do to disattached myself from him- emotionally, which is already proving really difficult. Someone help me ughhhhh. I wouldn't mind a private message or dm even...