Struggling getting over Ex

Hi all, I’m a 22yr old male, I just got out of a relationship with a girl (21) about a month ago. I was the one that ended it because of how badly the relationship was getting and how differently focused we were. I hated letting go of her and it’s the second relationship I’ve ever been in. I know I’m young and it was bound to happen but I didn’t realize how painful it would feel. About a week after we broke up she was already in bed with a different guy, she called him a “friend” but I’ve never heard or seen him before this night. She still had her find my iPhone on for me and I cried all night, I felt so crazy and I just wished she was drinking somewhere. Anyways, she admitted the next day to me that she cuddled with him and it wasn’t anything more than bc he cared. I ended things so nicely and with maturity, I made sure her thoughts were not harmful to herself but she never did or has with me. I just got on my old phone and saw her location was still on my old Snapchat and saw she was at some random house that I’ve never been to that is not affiliated with any family or friends of hers. I just feel so heartbroken the more times I see that stuff because in my gut I know she’s with a guy. I can barely text somebody and feel anything, I wish it was easier. I know it will get easier but right now I feel so low and I feel like a person I would do anything for would not do anything for me. I just wish memories or pain weren’t a thing but I guess that’s what makes us feel alive. I just wanted to rant because I don’t really have anyone outside of work buddies that will listen and I hate telling them everything. I honestly don’t know what to do, please anyone just respond and tell me it’ll be okay. Thank you