How do I move on? When I love him?

Hi This is my first time making a post bc idk what to do… I’ve been super depressed here lately bc I just got out of a 4 year relationship… I’m not usually depressed. I have my ups and downs but here lately I’m always crying, I miss “N” a lot, and my appetite has changed a lot. I have this feeling like I’m so empty… and it’s been 2 months since the breakup but I have this small feeling like I’ll never get over it… I loved him… more than I realized. I saw a future with him. The relationship had it’s ups and downs, a lot of people thought we were toxic and maybe we were, but there were also really good moments… however the relationship ended bc he went and had sex with another girl, and after he tried to claim that “I still love you” and “I only want you. She didn’t mean anything” and shit like that. I’ve been trying to move on, I really have been, but I’ve never just lost someone I loved like that before ya know? And there’s this new guy that came into my life after “N” did, who is an absolutely amazing guy. He’s way better than “N”. More mature and communicates better. Hell, he even reminds me of a boy version of me… but the problem is… I’m losing interest in “E”… and I think it’s bc he lives away from me and I don’t get that human interaction. But I also don’t want to lose “E” again… I just don’t know what to do… Do I leave E alone…? Do me and “E” stay friends…? I don’t know… I need help…